If a new position or a new toy isn't really your thing, you can always set a sex challenge for you and your partner to try. One to start with? "Have sex nightly for a month, no matter what," Dr. Cristina Bosch and Dr. John Robinson, The Sex Docs and owners of The Hormone Zone, tell Bustle. "Once you start having intercourse and simply bond with your partner sexually and intimately, then libido and desire will be enhanced."