Flexible Silicone Vibrator, 15cm — Groove Beam

A flexible curve, a ribbed head, and 15cm to find the right angle

The Groove Beam from DIK is a 20cm soft silicone vibrator with a gently curved shaft that flexes under pressure. That's exactly what you want from a prostate toy: enough curve to reach the P-spot without forcing anything, enough give to follow your body instead of fighting it.

The head is rounded and tapered, textured with fine ribs along its inner face. The shaft narrows through the midsection, then widens into a sturdy base that doubles as a handle. The result: penetration builds gradually, and you keep a firm grip even with wet hands.

One button controls 10 vibration modes, from a steady hum to sharp pulses. The whole thing is waterproof and submersible — dunk it without a second thought, use it in the shower or the bath. Silicone and ABS, phthalate and latex free, USB rechargeable, cable included.

What a flexible shaft actually changes

You stop fighting the toy. Rigid vibrators make you find the angle with your wrist. Here, the shaft absorbs part of the movement: you push, it bends, the head stays locked on the prostate. Less tiring, and a lot more forgiving if you shift position mid-session.

A diameter that stays reasonable. 3.6cm (1.4in) is comfortable for someone with a bit of experience, without being a wall for a motivated beginner. You're in the sweet spot where you feel it without spending twenty minutes opening up first.

The ribs on the head make themselves known on the way out. Going in, they glide. Coming back, they catch just slightly on the prostate. Small detail, but it's what separates this from a plain smooth shaft.

Actually waterproof. Submersible, not just "splash resistant." That means you can rinse it under the tap without babying it, and take it into the shower without worrying about the electronics.

It works outside too. The whole body vibrates: against the perineum, under the balls, along the shaft — the tapered head makes a solid external stimulator on its own.

Water-based lube, patience, and a hand on the handle

Water-based lube only. This is silicone: silicone lube attacks the surface and leaves it permanently tacky. Water-based, no exceptions, and top it up as you go — silicone drinks lube faster than people expect.

Warm up first. A lubed finger or two, enough for the sphincter to relax. Don't skip this because the diameter looks small — size isn't the problem, rushing is.

Go in cold, then switch it on. Insert the first few centimetres with the toy off, find your position, then start the vibrations once it's in place. Turn it on before you're in and you'll mostly just tense up.

Aim for the P-spot, don't chase depth. The prostate sits about 5-8cm in, on the front wall, toward the belly. Angle the curve forward and work it slowly. You don't need all 15cm — full depth is there for those who want it, not a goal to hit.

Keep hold of the handle. Important: this vibrator has no flared base like a plug. The base is wide and stable, but it's not built to anchor against your body. You never let go, and you never insert it all the way. If you want a wear-and-forget toy, get a plug — this isn't it.

Positions. On your back with knees pulled in for the easiest access, on your side for longer sessions, squatting if you want to control depth centimetre by centimetre.

Solo, in the shower, or while someone else does the work

Solo, this is a toy built for taking your time. Start on a low steady mode, build up gradually, and switch to a pulsing mode once things plateau. Plenty of guys discover prostate orgasms with a curved shaft like this rather than a static plug, precisely because you can move and adjust.

Paired with a handjob, this is where it gets serious: vibrations locked in, a hand on your cock, and the orgasm hits harder and longer than usual. If you tend to finish fast, the lower modes help you last too, by giving you something else to manage.

With a partner, he holds the handle and controls depth and rhythm while you do absolutely nothing. It's good territory for couples looking to explore anal play without jumping straight to fisting or anything oversized. It also works great as foreplay before sex — fifteen minutes of prostate vibration and you open up on your own.

And since it's submersible, shower sex actually becomes a real option, not just an idea that sounds good on paper.

Charging, cleaning, and the mistakes that ruin silicone

Charging: USB, cable included. Charge it fully before first use. Like any lithium-battery toy, avoid storing it dead flat for months — an occasional top-up charge keeps the battery healthy.

Cleaning: warm water and mild soap, or toy cleaner, before and after every use. It's submersible, so you can run it fully under water without worrying about the charging port. Pay extra attention to the ribs on the head — that's where residue builds up.

Drying: wipe it down with a clean cloth and let it air-dry fully before storing.

Lube: water-based only. No silicone, no oil, no petroleum jelly. It's the number one mistake, and it can't be undone.

Storage: silicone attracts dust and can react with other soft-material toys stored in contact with it. Keep it in a pouch, away from heat and direct sunlight.

Anal and shared use: put a condom on it if you're sharing it or switching uses. Silicone cleans up fine on its own, but this is the simplest way to not have to think about it.

Tech specs

FAQ — Your questions, answered

Q: Is it safe for anal use?

A: Yes, on one condition: you keep hold of the handle from start to finish. The base is wide and stable but it's not a plug-style anchor. Never insert it all the way, and never let go.

Q: Is 3.6cm (1.4in) manageable if I'm a beginner?

A: It's an intermediate size. If you've never inserted anything before, start with fingers or a small plug for a few sessions first. If you already have some practice, it goes in without trouble with enough lube.

Q: Are the vibrations strong?

A: The 10 modes cover a good range, from a background hum to sharp pulses. It's a versatile vibrator, not a jackhammer: solid power, evenly spread across the head.

Q: Is it actually waterproof or just water-resistant?

A: Submersible, as stated by the manufacturer. Shower, bath, rinsing under the tap — no issues at all.