You may actually be raring to go, but your partner's engine seems stalled.
Perhaps he's emotionally withdrawing, says Bob Berkowitz, PhD, co-author of "He's Just Not Up for It Anymore: Why Men Stop Having Sex, and What You Can Do About It."
"The usual problems between husbands and wives can play out in the bedroom," he says, especially if your partner has a hard time expressing his feelings properly. Or, he may want you to be more sexually adventurous.
Talk it out in a blame-free way. "It's understandable that a woman would feel rejected," Berkowitz says.
"But don't confront him with 'What the hell is going on? Are you cheating on me?' or he'll shut down. If a man's sex life is not working out, he may feel he's failed as a man, because men invest so much of themselves in their sexuality," Berkowitz adds.Health.com: The Top 10 Myths About Safe Sex