Merci P-Spot Cock vs. Vac-U-Lock Thin Dong: Which Prostate Dildo Fits Your Motorbunny?

Quick Answer

If you want a dedicated prostate-focused shape with a pronounced curve, the Merci P-Spot Cock is the stronger choice. If you prefer a slimmer, more versatile dildo that works with standard Vac-U-Lock attachments, the Vac-U-Lock Thin Dong offers a simpler, more affordable entry. Both can deliver prostate stimulation, but they differ in shape, girth, and how they mount to your Motorbunny.

Prostate play on a sex machine can be incredibly rewarding, but choosing the right attachment is key. The Merci P-Spot Cock and the Vac-U-Lock Thin Dong are two popular options, yet they serve different needs. This comparison breaks down their shapes, materials, and compatibility so you can decide which one belongs on your Motorbunny.

We'll focus on what actually matters: how each dildo feels, how it fits your machine, and who it's best for. No fluff, just the facts you need to make a confident purchase.

Shape and Design: Curve vs. Straight

The Merci P-Spot Cock is specifically designed for prostate stimulation. Its pronounced curve and bulbous head are engineered to press against the prostate when inserted. This targeted shape can be more effective for hands-free play, especially when the Motorbunny's vibrations are added to the equation.

In contrast, the Vac-U-Lock Thin Dong is a more traditional, straight dildo. It's slimmer and less specialized, but that makes it more versatile for other types of play. If you're new to prostate massage or prefer a gentler, less intense sensation, the thinner profile might feel more comfortable.

• Consider the Merci P-Spot Cock if you want a shape designed specifically for prostate targeting.
• Choose the Vac-U-Lock Thin Dong if you prefer a simpler, more versatile dildo.

Material and Texture: Silicone vs. TPE

The Merci P-Spot Cock is made from body-safe silicone, which is non-porous and easy to clean. Silicone also transmits vibrations well, so you'll feel more of the Motorbunny's power. This is a big plus for prostate play, where vibration can be a key part of the experience.

The Vac-U-Lock Thin Dong, on the other hand, is typically made from TPE (thermoplastic elastomer). TPE is softer and more flexible, but it's porous, meaning it requires more careful cleaning and can't be fully sterilized. It's also less effective at transmitting vibrations, so you might feel less of the machine's rumble.

• Silicone (Merci P-Spot Cock) is non-porous and easier to sanitize.
• TPE (Vac-U-Lock Thin Dong) is softer but more porous, so clean it thoroughly after each use.

Compatibility and Mounting

The Merci P-Spot Cock uses a Vac-U-Lock hole at its base, making it compatible with any standard Vac-U-Lock adapter on your Motorbunny. This is a secure and familiar mounting system, so you can swap attachments quickly without fiddling with straps or rings.

The Vac-U-Lock Thin Dong also features a Vac-U-Lock hole, so it mounts the same way. The key difference is the shaft's diameter: the Thin Dong is slimmer, which some riders find easier to insert and control. However, the thinner profile may also feel less stable during intense riding, so consider your comfort level.

• Both attach via Vac-U-Lock, so you can use them with most Motorbunny models.
• If you have a Motorbunny BUCK, double-check that your adapter fits the attachment's base.

Trade-Offs at a Glance

• Shape: Merci P-Spot Cock has a curved, prostate-focused design. Vac-U-Lock Thin Dong is straight and more generic. If prostate targeting is your priority, the curve wins.
• Material: Merci P-Spot Cock is silicone (non-porous, easy to clean). Vac-U-Lock Thin Dong is TPE (softer, but porous). Silicone is easier to keep hygienic and transmits vibrations better.
• Girth: Merci P-Spot Cock has a fuller girth (around 4.75 inches). Vac-U-Lock Thin Dong is slimmer, which may be more comfortable for beginners. Thinner isn't always better; it depends on your experience and comfort.

Product Facts

• Premium Silicone "My Friend Dick" Penis Style Attachment: This premium silicone attachment offers the soft feel of silicone and an easy to clean surface. Made of 100% non-porous silicone for easy sterilization. 6.5-inch shaft with 4.75-inch circumference. Same look and feel of an actual penis. Compatible with Sybian®. Only compatible with Motorbunny Original. Not compatible with Motorbunny Buck. If you're comparing prostate dildos, this attachment gives you a realistic, non-porous silicone option with a familiar shape. Its 6.5-inch length and 4.75-inch girth are close to the Merci P-Spot Cock's dimensions, but it lacks the specialized curve for prostate targeting. It's a solid alternative if you want a lifelike feel and easy cleaning, but you'll need to angle your hips for prostate contact.



• Motorbunny Original Flat Silicone Attachment: Made of premium, 100% silicone, this is a tried and true hit! Except this time it comes in pink silicone for easier cleaning and higher durability. Compatible only with Motorbunny Original. Premium Body Safe Silicone. Clitoral stimulation nub. Attachment and accessory returns not accepted. This attachment is not a prostate dildo, but it's a useful point of reference for silicone quality and cleaning. If you already own this attachment, you know how easy silicone is to maintain. For prostate play, you'd still want a shaped dildo like the Merci P-Spot Cock, but this flat attachment shows the brand's commitment to body-safe materials.

Which One Fits You?

Best For

• Riders who want a dedicated prostate toy with a curve that hits the spot automatically.
• Those who prefer non-porous silicone for easy cleaning and better vibration transfer.

Not For

• If you're a beginner or prefer a slimmer, more forgiving dildo, the Vac-U-Lock Thin Dong might be a better start.
• If you own a Motorbunny Buck, double-check compatibility—some attachments are only for the Original.

Both the Merci P-Spot Cock and the Vac-U-Lock Thin Dong can deliver prostate pleasure on your Motorbunny, but they cater to different needs. Choose the Merci for targeted, intense stimulation with easy-to-clean silicone. Choose the Thin Dong for a gentler, more versatile option that's often more affordable. Match your choice to your experience level and what you want out of your ride.