This toy from UK's Rocks-Off has a stay-put plug shape and uses a seven-speed removable bullet vibe to stimulate the perineum and prostate at the same time. Vibrations help get the blood flowing and relax anal muscles. Naughty Boy is made of 100% silicone, is waterproof, and uses one 1.5 volt battery.

Measuring 4.5 inches (11.4 cm) in Insertable length, and 1.25 inches (3.2 cm) in diameter at its widest point