A frank, judgement-free guide for adults (18+) Choosing Your First Dildo Size.
Quick Stats At A Glance
| What To Know | Helpful Starting Point |
|---|---|
| Average erect penis length | Around 5.1 to 5.5 inches in global studies. |
| Beginner dildo length | Around 4 to 6 inches is usually a more comfortable first range. |
| Beginner dildo girth | Around 4 to 4.5 inches in circumference is often easier for first-time users. |
| Most important sizing factor | Girth often affects comfort more than length, especially for beginners. |
| Common beginner mistake | Choosing a toy based on looks or size alone instead of comfort, shape, material, and intended use. |
Buying your first dildo is exciting, a little nerve-wracking, and surprisingly more complicated than people expect. Walk into any well-stocked adult retailer (or scroll through an online catalogue) and you’ll be met with a wall of silicone, glass, and steel in every shape, length, and colour imaginable. Where on earth do you start?
The honest answer: with size. Get the size right and almost everything else falls into place. Get it wrong and your shiny new toy ends up shoved to the back of a drawer, a quietly expensive lesson in “bigger isn’t better.”
This guide walks you through choosing your first dildo size based on your body, your experience level, who you’re playing with, and what you actually want it to do. We’ll cover materials, styles, intended use, and a few practical things nobody tells you — like where you’re going to keep the thing once you own it.
Before we go further, if you’re wondering whether you should be looking at a vibrator instead, this excellent breakdown of vibrators vs dildos is worth a read.
Why Size Matters More Than You Think
The “Goldilocks Problem”
Most first-time buyers default to one of two mistakes:
- Going too big because they assume bigger equals better pleasure
- Going too small because they’re nervous and want something “safe”
Both lead to disappointment. A toy that’s too large causes discomfort, pelvic floor tension, and sometimes outright pain — none of which is sexy. A toy that’s too small can feel underwhelming and fail to provide the stimulation you were after.
Beginner Size Recommendations
| Insertable Length | Girth / Circumference | Best Suited To |
|---|---|---|
| 3 to 4 inches | 3.5 to 4 inches | Total beginners, petite frames, and anal first-timers. |
| 4 to 6 inches | 4 to 4.5 inches | Most first-time vaginal users. |
| 6 to 7 inches | 4.5 to 5 inches | Experienced beginners or people who already know they prefer more length. |
| 7+ inches | 5+ inches | Usually not recommended as a first dildo size. |
Length vs Girth — Which Matters More?
Honestly? Girth. Most people can comfortably accommodate more length than they expect, but girth is what determines whether something feels pleasurable or uncomfortable. The average vagina is roughly 3–4 inches deep at rest (expanding with arousal), and most pleasurable nerve endings sit within the first 2–3 inches. The same logic applies to anal play, where the sphincter is the bottleneck — not internal depth.
If you remember nothing else from this guide: measure girth, not just length.
Match the Toy to the Use Case
Who you’re playing with — and how — should drive your choice as much as your body does.
Solo Play
For solo use, prioritise ease of handling. A slightly curved shaft (around 5–6 inches) with a flared base or suction cup gives you flexibility without requiring a contortionist’s reach. Suction-cup models are brilliant for hands-free play against a wall, floor, or chair.
Couples Play
If a partner will be wielding the toy, you can go slightly longer because they have a better angle and more control. Look for:
- A defined handle or grip ridge
- Moderate flexibility (not rock-hard)
- A non-intimidating shape if your partner is new to using toys on you
Role Play & Fantasy
Role play opens the door to strap-on compatible dildos with O-ring bases. Start with something realistic and modest (5–6 inches) before exploring fantasy shapes. Strap-on play has a learning curve for the wearer, and fighting an oversized toy while learning the mechanics is frustrating.
M2M (Anal-Focused) Play
For anal-focused play between men — or anyone exploring prostate stimulation — the rules change:
- Always choose a dildo with a flared base. Non-flared toys are an emergency-room visit waiting to happen.
- Start smaller than you think you need: 1–1.25 inches in diameter is plenty for a first toy.
- A gentle curve hits the prostate (roughly 2–3 inches inside the rectum, toward the belly button).
- Tapered tips make insertion significantly easier.
Long-Distance & Shared Play
Some app-controlled dildos let a partner control vibration patterns remotely. These are usually pricier and more complex — generally not ideal for a first purchase, but worth knowing exist.
Materials: What You Are Actually Putting In Your Body
Material matters for safety, comfort, sensation, and how long your dildo will last. For a first toy, it is usually better to choose something body-safe, easy to clean, and simple to use with lubricant.
Body-Safe Materials Recommended For Beginners
| Material | Feel | Why People Choose It | What To Keep In Mind |
|---|---|---|---|
| Medical-grade silicone | Soft, smooth, and slightly warming | Non-porous, easy to clean, long-lasting, and a strong beginner choice. | Usually works best with water-based lubricant. |
| Borosilicate glass | Smooth, firm, and temperature-responsive | Non-porous, easy to clean, and compatible with most lubricants. | The firm feeling may be too intense for some first-time users. |
| Stainless steel | Heavy, cool, and very firm | Very durable, non-porous, and easy to clean thoroughly. | The weight and firmness usually suit more experienced users. |
| Ceramic | Smooth, firm, and weighty | Can be body-safe, attractive, and easy to clean when properly glazed. | Less common and may chip or break if dropped. |
Materials To Use With Caution
- TPE and TPR: Soft and realistic-feeling, but often porous. Use a condom over the toy and replace it regularly if you choose this material.
- Jelly rubber: Often used in cheaper toys and may contain unwanted chemicals. It is generally better to choose a safer material where possible.
- Latex: Some people are allergic to latex, and it can also be porous. Check the material carefully before buying.
- PVC: Quality can vary a lot. Look for clear product information and phthalate-free labelling.
Materials To Avoid
Avoid toys with no listed material, very cheap novelty toys with vague product details, and anything that has a strong chemical smell when opened. If the product description does not clearly explain what the toy is made from, it is usually safer to choose something else.
A Note on Realistic Skin-Feel
If you want that realistic, fleshy feel, look for dual-density silicone — a firm core with a softer outer layer. It’s pricier but body-safe and gives the squishy realism that TPE is known for, without the porosity issues.
Style And Shape: Beyond The Basics
Dildo style can change comfort, sensation, and how easy the toy is to use. For a first dildo, the safest choice is usually simple, smooth, and easy to control before moving into more textured or advanced designs.
| Style | What It Feels Like | Beginner Verdict |
|---|---|---|
| Realistic dildos | Designed to mimic anatomy, often with veins, a glans, and sometimes testicles. | Good if you like realism, but textured detail may feel irritating for sensitive tissue. |
| Smooth or non-realistic dildos | Simple, smooth, and predictable, without veins, ridges, or strong texture. | Often one of the best first choices because it is easier to insert and control. |
| Vibrating dildos | Adds vibration for extra external, internal, clitoral, or perineal stimulation. | Useful for solo play, but a non-vibrating dildo is usually simpler and cheaper for a first toy. If you prefer simple products without charging or batteries, sex toys that don’t need batteries may suit you better. |
| Rotating or thrusting dildos | Uses mechanical movement to rotate, thrust, or create stronger internal sensation. | Not ideal for beginners. Size, angle, and movement can feel intense fast. |
| Curved G-spot or P-spot dildos | A gentle curve helps target internal pleasure spots with less awkward wrist movement. | A strong beginner option if the curve is gentle and the size is comfortable. |
| Fantasy and creature dildos | Creative shapes, unusual textures, and non-realistic designs such as tentacles or fantasy styles. | Better saved for later because the shape and size can be less predictable. |
| Double-ended dildos | Long, flexible, and designed with two usable ends for partner play or dual penetration. | Too niche for most first-time buyers. |
Body Shape, Fitness & Comfort
Your body’s proportions matter more than internet averages.
Frame & Build
- Petite/shorter frame (under 5’4″): Lean toward 4–5 inches insertable. Long toys can hit the cervix uncomfortably.
- Average frame: 5–6 inches is the sweet spot.
- Taller/larger frame: You may comfortably handle 6–7 inches, but girth still matters more than length.
Pelvic Floor Fitness
A relaxed pelvic floor accommodates more comfortably than a tense one. Signs of a tight pelvic floor include:
- Pain with tampon insertion
- Discomfort during penetrative sex
- A history of pelvic pain or endometriosis
If any of these apply, start smaller than the recommendations above and consider speaking to a pelvic floor physiotherapist. There’s no prize for jumping straight to the big toys.
Postpartum, Menopause & Hormonal Changes
Vaginal tissue changes with hormones, childbirth, and age. Postpartum bodies often need a gentler reintroduction. Menopausal bodies may experience reduced natural lubrication, so use plenty of water-based lube regardless of toy material. A smaller, softer silicone dildo is forgiving across all life stages. For related comfort advice, see safe sex toys during pregnancy.
Hand Strength & Mobility
This gets overlooked: heavier toys (glass, steel) require grip strength and wrist mobility. If you have arthritis, RSI, or limited hand function, choose a lightweight silicone toy with a defined handle, or a suction-cup model that doesn’t require gripping at all.
Body Position Considerations
Your favourite position affects ideal length. Lying on your back with knees up = shorter toys feel deeper. Doggy-style angles = longer toys are more comfortable. Experiment.
Practical Buying Tips
Online vs In-Store
Online offers privacy, more selection, and detailed measurements (always check actual dimensions, not just photos — products often look bigger on screen).
In-store lets you feel the firmness, weight, and material in person. Reputable adult retailers have knowledgeable staff who answer questions without judgement. For more buying guidance, browse further how-to articles here.
Should You Think About Budget?
Briefly, yes. A reasonable first-toy budget is enough to get body-safe silicone but doesn’t need to stretch to luxury. Spending almost nothing usually means questionable materials; spending a fortune on a first toy you might not love is a gamble. Mid-range body-safe silicone is the sensible middle ground.
Don’t Forget the Essentials
- Lube: Water-based works with everything. Silicone lube cannot be used with silicone toys (it degrades them).
- Toy cleaner or unscented mild soap
- Storage: Toys need to be kept clean, dust-free, and separate from each other (some materials react when stored touching). Dedicated sex toy storage bags solve this neatly and discreetly.
Cleaning Basics
Wash before and after every use. Silicone, glass, and steel can be boiled (no motors!). Porous materials need extra care and shouldn’t be shared between partners or orifices without a fresh condom.
Final Checklist Before You Buy
Run through these before clicking “purchase”:
- I’ve measured (or honestly estimated) what girth feels comfortable
- The length suits my frame, not someone else’s fantasy
- I’ve chosen a material that is body-safe (silicone, glass, or steel for first toys)
- The base is flared if there’s any chance of anal use
- The shape suits my intended use (solo, couples, role play, etc.)
- I’ve factored in lube, cleaner, and storage
- I’m buying for my body, not internet expectations
Choosing Your First Dildo Size FAQs
What size dildo is best for beginners?
Most beginners start with a dildo that is around 4 to 6 inches in insertable length and 1 to 1.5 inches in width. A smaller size is usually more comfortable and easier to get used to.
Is girth or length more important?
For many people, girth has a bigger impact on comfort than length. A toy that is too thick can feel uncomfortable, especially for first-time users. Starting with a slimmer dildo is often a better choice.
Should I buy a realistic dildo or a smooth design?
This depends on personal preference. Realistic dildos have more texture and detail, while smooth designs are often easier for beginners because they insert more comfortably.
What material is best for a first dildo?
Body-safe silicone is one of the best options for beginners. It is soft, easy to clean, non-porous, and comfortable to use. Avoid cheap jelly or rubber materials when possible.
Do I need lubricant when using a dildo?
Yes, lubricant can make the experience much more comfortable and enjoyable. Water-based lubricant is usually the safest choice because it works with most sex toy materials, including silicone.