Sex is a team sport, not a one-man game. As such, it's most titillating when both partners are getting their needs met and fantasies realized. "Research shows that the best sex is often the result of the man letting his partner have a lot of influence over their love-making experience," says Parrott. Men: Encourage your partners to express themselves about their sexual wants and needs. Fulfilling another's desires can sometime be the secret to spectacular sex.