How to Choose the Right Dildo Size, Shape and Material

By Simply Pleasure | Published: 2026-10-13

Category: Buying Guides

A practical guide to matching dildo size, shape, and body-safe material to your experience level and anatomy, with clear rules for beginners and beyond.

Quick answer

Start with a dildo that has a usable length of 4–6 inches and a diameter of 1–1.5 inches, made from phthalate-free silicone. Prioritize a tapered or gently curved tip and a firm core with a soft outside. If you want hands-free play, choose a wide suction-cup base. Upgrade size only after you know your comfortable limits.

Size: measure what you can actually use

Ignore the total length printed on the box and look for insertable length. A 14-inch dildo may only offer 10–12 inches of insertable length once the base and balls are excluded. For a first purchase, aim for 4–6 inches insertable and 1–1.5 inches diameter. If you already know you enjoy fullness, move up in 0.25-inch diameter steps rather than jumping an inch at a time.

Diameter matters more than length for comfort. A dildo that is too wide causes a burning or stretching sensation; a dildo that is too long but slim is easier to control. Measure your current favorite toy with a cloth tape or a piece of string, then match that number to the product's listed diameter. If a listing only gives circumference, divide by 3.14 to get diameter.

Beginners: 4–6 inches insertable, 1–1.5 inches diameter
Intermediate: 6–8 inches insertable, 1.5–1.75 inches diameter
Advanced: 8+ inches insertable, 1.75+ inches diameter

Shape: match the curve and texture to your goal

A tapered tip eases insertion and lets you control depth gradually. A curved shaft targets the G-spot or prostate. Realistic veins and a defined glans add internal friction, which some people love and others find distracting. Textured surfaces such as suckers or bumps intensify sensation but need more lubricant.

For hands-free play, check the base. A wide suction-cup base sticks to flat surfaces like tile or a chair seat. A flared base also makes the toy harness-compatible and safer for anal use. If the base is narrow or rounded, plan to hold it.

Tapered tip: easiest insertion, good for depth control
Curved shaft: better for internal spot stimulation
Textured surface: more sensation, requires extra lube
Wide suction base: hands-free and harness-ready

Material: silicone vs glass and what to avoid

Body-safe materials are non-porous, phthalate-free, and easy to clean. Platinum-cure silicone is the most common choice: it is soft yet firm enough for pressure, warms to body temperature, and can be boiled or washed with toy cleaner. Glass is firmer, heavier, and compatible with any lubricant, but it offers no give and can chip if dropped. TPE, TPR, PVC, and jelly materials are porous and can harbor bacteria even after washing, so skip them for internal use.

Silicone is not compatible with silicone-based lubricant, which can degrade the surface. Use water-based or hybrid lube with silicone toys. Glass works with water-, silicone-, or oil-based lube. If you want to use silicone lube, choose glass or a hard plastic toy.

Silicone: soft, body-safe, water-based lube only
Glass: firm, any lube, handle with care
Avoid: TPE, TPR, PVC, jelly for internal use

Decision rules for buying your next dildo

If you are a first-time buyer: Choose a tapered silicone dildo with 4–6 inches insertable length and 1–1.5 inches diameter. Avoid textured or extra-wide models until you know your comfort zone. Start smaller than you think you need.
If you want hands-free play: Look for a wide suction-cup base that sticks to flat surfaces. Check that the base is flared if you plan to use it anally or with a harness. A stable base changes how you can use the toy.
If you prefer realistic sensation: Choose a dildo with a defined glans, veined shaft, and soft-to-touch exterior over a firm core. This adds friction and fullness without extra width. Texture can substitute for size.
If you want the easiest cleanup: Stick to phthalate-free silicone or glass. Both are non-porous. Avoid TPE, TPR, PVC, and jelly for internal use. Body-safe materials are worth the higher price.

Product facts

Creature Cocks Aqua-Cock Glow In The Dark Silicone Dildo Blue Pink Orange: Made from premium, phthalate-free silicone with a firm core and soft outside, and it glows in the dark. Body-safe silicone is non-porous and easy to clean, while the firm core with soft exterior balances pressure and comfort. Glow-in-the-dark helps you find it in low light.
Creature Cocks Tentacle Cock Silicone Dildo Red Blue: Tapered tip for easy insertion, textured with suckers and bumps, and a wide base that provides powerful suction for hands-free use. The taper supports gradual depth control, the texture adds sensation for those who want it, and the suction base lets you play without holding it.
RealRock Extra Long Dildo With Balls Pink 14 Inch: Realistic veins on the shaft, a shapely glans, and a scrotum, with a suction cup for sturdy hands-free use. The veined texture and defined head provide lifelike internal stimulation, and the suction cup adds stability if you want to ride it.
Master Series The Hush Gag Silicone Comfort Ball Gag Red Black: Ball gag with a silicone ball, corner straps to reduce chafing, and an adjustable locking buckle. If you are exploring gag play alongside dildos, the silicone ball is odorless and tasteless, and the corner straps improve comfort during wear.