"The Engineer"

Depth matters to "The Engineer". Its Touch-Sense technology reads how deep it goes and adjusts the vibration to match, which turns a solo session into something that responds to you rather than the other way round. The 180° suction cup locks onto tiles, a headboard or the floor, so your hands are free for whatever else you fancy.

Made from food-grade silicone with a polycarbonate core, it measures 27.2 cm overall with a girth of 11.6 cm. Lovense says a full charge takes about 80 minutes and gives you up to 230 minutes of play, and rates it IPX7 for shower company. At under 47 dB it stays discreet, and it comes with a one year warranty. Reviewers give it 4.8 out of 5 across 45 ratings.

The catch: of that 27.2 cm, 14 cm is insertable. The rest is suction cup and base, so measure your expectations before you order.