Lubrication is your friend. Whether you use App controlled sex toys for couple made of hard plastic, silicone or glass, you'll want to make sure that it's properly lubricated for maximum comfort and pleasure. Lubrication also helps reduce the risk of skin irritation (more on that below).The most common type of water-based lubricant is Astroglide, which comes in a handy pump bottle so you don't have to keep dipping your hand in the tub. The downside is that it can be expensive if you're using it frequently—one bottle might not last as long as you'd hope! You could also try coconut oil or another natural substance like this one. Just ensure that whatever lube you choose doesn't contain any glycerin whatsoever; otherwise it could cause vaginal infections if used internally (not fun).