The beginning of a relationship is its own drug. There’s the novelty, the anticipation, the constant gravitational pull toward another person. Sex is frequent and charged with an electricity that feels, in the moment, like it couldn’t possibly wear off. And then, after some time, it just…does. Most people reach for the simple explanation: novelty. It’s not new anymore, so it’s not as exciting. True, as far as it goes. But according to therapists and psychologists who work with couples, the full picture is considerably more complicated than that. Videos by VICE Somatic therapist Briony Montgomery , speaking with Body+Soul , has a theory that takes a second to land. Feeling safe, truly safe, with another person can actually suppress desire. The nervous system, which spent the early months of the relationship running on adrenaline and anticipation, suddenly has nothing to scan for. “When your body is constantly scanning for what might go wrong, it’s very difficult to drop into pleasure,” she says.…