Choosing Size When You're Not Sure: A Checklist Before You Click Buy
It's 11 p.m., the tape measure is on the bed, and you're trying to work out whether 1.5 inches counts as a lot.
A size guide for people who don't own a tape measure and don't want a drawer of near-misses: what to measure, what to ignore, and when small wins.
The Short Answer
Ignore total length and compare two numbers instead: contact width for external pieces and diameter for internal ones. For a first purchase, 1 to 1.5 inches of diameter and 1 to 2 inches of contact width covers most people comfortably. Anything marketed primarily on length is selling capability rather than fit. If you're between two sizes, take the smaller one; it's easier to add pressure than to subtract it.
Length Is the Number Everyone Lists and Nobody Needs
Length sells because it's easy to photograph next to a ruler. It also tells you the least about how a product will feel. A 7-inch piece with a 1-inch contact face behaves like a pen tip. A 4-inch piece with a 2-inch face feels broader and steadier in the hand. Think about the last time you bought something because the number was bigger, and how that worked out.
Usable insertable length is the only length figure worth reading. That's the measurement from the tip to the point where the body would stop, not the full housing. For most people, 3 to 5 inches is plenty, and anything past that is a handle you're paying for.
Girth and Contact Width, Measured Simply
Girth is where comfort actually lives. Diameter between 1 and 1.5 inches is the range most first-time buyers settle into, and 1.25 inches is a reasonable middle. Above 1.75 inches, you're in territory that needs a deliberate preference rather than a hopeful guess.
For external pieces, measure the mouth or face across its widest point. Under 1 inch reads as a point and demands precise placement. Between 1 and 2 inches spreads pressure. Over 2 inches is broad and can feel diffuse if you want precision, which is the honest trade-off of the wider shape.
The Finger Test, and What It Tells You
You already own a measuring tool. An average adult index finger is roughly 0.6 to 0.7 inches across at the middle joint, so two fingers side by side is about 1.3 inches. That's your reference for diameter, and it's accurate enough to rule out the extremes.
Try this on a Sunday morning when you're not in a hurry: wrap a thumb and forefinger around the base of the other index finger. The gap tells you what feels like "enough" versus "a lot." It's crude. It's also more informative than a product photo with no scale.
Internal Sizing Without Guessing
For internal use, diameter matters more than length, and the shape of the tip matters more than both. A rounded, tapered tip inserts more comfortably than a blunt one at the same diameter. A curved body reaches differently than a straight one, which is why dual-stimulation designs are shaped the way they are.
If you're unsure, start with the smaller diameter and a shorter insertable length. You can always size up on the second purchase with real information. The reverse is expensive and discouraging, and the piece usually ends up at the back of a drawer.
When Smaller Is the Better Buy
Smaller is better in three situations: a first purchase, a shared apartment where you want something you can hold in one hand, and any purchase where travel is likely. A compact piece under 4 oz gets packed. A heavy one stays home.
Smaller also wins when the alternative is a design with more motors. Every added motor adds weight and noise, and noise is the constraint people underestimate most. On a quiet evening, the smaller piece is the one you'll actually reach for. Skip the compact option if you already know you want reach and heft; that's a preference, and it's worth paying for once you have it.
If you're shopping before bed and can't decide, default to the smaller piece. At 11 p.m., almost nobody wishes they had bought the heavier option.
When Size Isn't the Problem at All
The honest limitation of any size guide is that fit is only one variable. If the shape is wrong, the right diameter won't save it. If the motor is buzzy rather than deep, a perfect 1.25 inches still feels thin. And if you've never used anything, no measurement will substitute for the first ten minutes of actually trying it.
One Box, Three Sizes of Experience
If you're still holding the tape measure, the lower-risk move is to stop measuring and start with a set that covers more than one shape.
- Self-Love Ritual Bundle: three pieces that cover the size question from both directions. HOPSTAR is the compact external piece with a broad mouth, GODLIKE is the dual-stimulation piece with a curved handle for reach, and Velvet Touch water-based lubricant makes the first attempt easier. Suited to a first purchase or a drawer reset. Try one piece per session and let fit decide, not the spec sheet.
- Browse the Customer Favorites collection to compare compact and full-size formats in one place.
- Related reading: choosing a size for someone else without asking
- when upgrading means changing size, not adding features
- the case against buying the bigger option
Sources
- Kinsey Institute — research on the wide range of reported comfort and preference.
- American College of Obstetricians and Gynecologists — patient education on comfort and lubrication.
- International Electrotechnical Commission, IEC 60529 — the rating standard behind water-resistance claims.
This content is general education, not medical advice. If insertion is painful rather than unfamiliar, that's a conversation for a clinician.
