Sex is to a happy relationship what butter is to a lobster feast: Totally and completely necessary. “It’s something you do with your partner that most people don’t do with anyone else, so it sets the relationship apart and makes it special,” says clinical psychologist Ursula Ofman, Psy.D. Ready to make the most of that exclusive bond? Here, experts share the bedroom routines that separate the so-in-love couples from the rest. Try them out and recapture that can’t-keep-your-hands-off-one-another feeling in no time flat.