Sex Machine Buying Guide — Types, Specs & What to Actually Look For

Sex machines are one of the larger discretionary purchases in this category — entry-level units start around $150, mid-tier machines sit in the $300–450 range, and the top end runs to $1,650 and beyond. That's a meaningful spread, and most of what's written about it online is either marketing copy from the manufacturers or short reviews that don't compare specs across machines.

The market is also confusing because specs aren't standardised. One brand lists stroke length in inches, another in centimetres. Some give a maximum speed, others give a range. Attachment compatibility varies — a machine that takes Vac-U-Lock is a different proposition from one that only takes the manufacturer's proprietary attachments. The result is a category where the price tag doesn't always correlate with what you'll actually get out of the machine.

This guide covers the four main types of sex machine, the specs that actually matter, and recommendations at every price tier. The aim is to give you a useful framework for deciding what to buy, rather than a list of "best" picks without context.

The four types of sex machine

Thrusters. The most common type. A motorised arm drives a dildo or attachment in and out at a controllable speed and stroke length. Thrusters are the most versatile category — most use the Vac-U-Lock attachment system, which means a wide range of dildos work with them. If you're only buying one machine, a thruster is usually the answer.

Saddles. You sit or straddle the machine; vibration rather than thrusting drives the experience. Better for clitoral stimulation than internal stimulation, and the form factor is closer to a piece of furniture than a portable device. Motorbunny is the category leader; The Cowgirl is the other notable option.

Strokers. Designed for people with penises. Rather than you moving around the machine, the machine moves around you. The Kiiroo Keon is the dominant option here — interactive, app-controlled, and increasingly common as the standard reference point for the category.

Hybrids. Combine saddle vibration with thrusting or rotational motion. The Motorbunny Buck is the main example — $1,499+ and squarely a top-end purchase. Capable, but not a sensible first machine.

What specs actually matter

Stroke length. How far the arm travels on each thrust. 15–20cm is typical for thrusters. Longer isn't automatically better — what matters is matching your anatomy and the attachment you're using. A long stroke with a short attachment can mean the tip exits between strokes, which isn't always the desired sensation. A short stroke with a long attachment means most of the attachment is doing nothing.

Strokes per minute (SPM). Speed range matters more than peak speed. A machine that only goes fast is uncomfortable; one that only goes slow is limited. Look for a wide range, ideally 0–250 SPM or thereabouts, with smooth speed control rather than discrete steps.

Attachment system. Vac-U-Lock is the industry standard. Machines with Vac-U-Lock take attachments from a wide third-party market, including Doc Johnson's catalogue. 3XLR threading is common on budget machines and limits you to the manufacturer's own attachments. Proprietary systems — found on some saddle and hybrid machines — are even more restrictive. Check attachment compatibility before buying, because it determines what your machine can do six months from now.

Noise. Almost never listed in spec sheets, and a real differentiator. Budget thrusters can be loud enough to be heard through walls. Mid-tier and premium machines are typically quieter, but not always — read reviews specifically for noise if you live in a shared space.

Weight and portability. Saddle machines are heavy. The Motorbunny Original is 13.6kg — this is a piece of furniture you find a place for, not something you tuck under the bed. Thrusters vary from genuinely portable (under 4kg) to substantial floor units. If storage matters, factor it in before buying.

Product recommendations by budget

Entry level ($150–250)

b-Vibe Thrusting Dildo Machine — $156. A thrusting machine from a well-regarded body-safe brand. The lowest-risk way to find out whether a sex machine actually suits you, before committing to a $500+ unit. Limited attachment compatibility, but adequate for trying the category.

Hismith Powerful Portable Sex Machine — $204. Portable thruster, good for storage and travel. Hismith is one of the more established budget brands and the build quality is acceptable for the price.

Mid range ($300–450)

Fredorch F19 Premium Sex Machine (Remote, Vac-U-Lock) — $319. The most popular mid-tier machine. Remote control, Vac-U-Lock compatible — meaning you can expand your attachment collection over time. This is the price tier where the build quality starts to feel like a real piece of equipment rather than a gadget.

Fredorch F19 Premium Bundle (Remote, Vac-U-Lock) — $399. The same machine with attachments included. Worth the upcharge if you don't already own Vac-U-Lock attachments.

Fredorch Premium (Wired/Wireless, Double Rod) — $370. Double-rod design adds stability at higher speeds — relevant if you intend to use the machine at the upper end of its range.

Premium ($599–999)

The Cowgirl Premium Sex Machine — $599. Saddle-style, designed primarily for clitoral stimulation. Strong community following and a more approachable price point than the Motorbunny Original while staying in the saddle category.

Motorbunny Jack — $799. Motorbunny's handheld thruster. App-controlled, Vac-U-Lock compatible. The thrusting equivalent of the saddle Original — same brand quality, different form factor.

Motorbunny Original — $999. The original saddle machine. 7,000 vibrations per minute at peak, app and Bluetooth control, four attachments included. At 13.6kg, this is a piece of furniture, not a toy. The build quality and longevity are why it commands the price.

Top end ($1,499+)

Motorbunny Buck — $1,499. Hybrid saddle and thrusting. The most capable machine in the consumer catalogue, and squarely a long-term purchase rather than an experiment. Not a sensible first machine — buy the Original or Jack first if you're new to the category.

What to buy based on what you want

A short decision framework. First machine, limited budget → Fredorch F19 ($319) — Vac-U-Lock means you can grow into it. Clitoral focus → The Cowgirl ($599) or Motorbunny Original ($999). Thrusting, serious use → Motorbunny Jack ($799). Everything in one → Motorbunny Buck ($1,499).

The most common mistake is overspending on a first machine. The Fredorch F19 will tell you whether you actually want to use a sex machine regularly. If you do, the resale market for sex machines is essentially nonexistent — your $319 is a sunk cost rather than something to recoup. But it's a much smaller sunk cost than a $1,499 Buck that turns out to live in the cupboard.

Attachments matter as much as the machine

A machine is only as good as the attachments you use with it. Vac-U-Lock is the standard to look for: it opens up the widest range of compatible dildos and accessories, including most of the realistic and fantasy options worth owning. A machine without Vac-U-Lock — even a good one — locks you into the manufacturer's catalogue, which is usually limited and rarely as well-priced as the third-party market.

If you already own dildos with flared bases, you can adapt many of them to Vac-U-Lock with an aftermarket adapter, but adapter quality varies. Buying purpose-built Vac-U-Lock attachments alongside a new machine is the more reliable path.

Find the right machine

The Measured Pleasure machine catalogue lets you filter by type, stroke length, speed range, and attachment system across every machine listed in this guide and many more. If you want to compare specs side-by-side rather than reading individual product pages, that's the tool to use.

You can browse all sex machines on Measured Pleasure filtered by stroke length, speed, and attachment system.