"Try something new," says Esther Perel, a couples and family therapist and author of Mating in Captivity: Reconciling the Erotic and the Domestic.
"Desire is numbed by repetition; eroticism thrives on the mysterious, the novel, and the unexpected," Perel says. So "flirt with your partner. Teasing and flirting to create anticipation is seductive. Flirting comes from the French fleuret -- the tip of a sword -- with which you tease about what could be. That is a massive turn on," Perel says.
Physical activity is also a good thing to try, if you like that sort of thing. "If you hate physical exercise, I don't suggest it. But if you like it, I suggest going a step farther than when you would normally stop," Perel says.