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5. You have sexual thoughts of being with other women
Let's face it: If you're a living and breathing, red-meat-eating, SportsCenter-watching man, you're bound to entertain thoughts of having sex with other women. If you didn't, no porn company in the world could ever operate in the black. When your mind starts to wander, however, it's only a matter of time before your body starts to follow. You might even find you're unable to perform with your partner unless you imagine she's someone else (should that someone else be Star Jones, you might want to rush into therapy immediately).
4. You let your girlfriend understand it's okay to cheat
By relaxing your moral code, you hope your partner will be more understanding if she eventually catches you playing nude Twister with the maid. You suggest threesomes might be worth a shot, you tell her that monogamy is overrated, and you even try to convincing her that you're one-third Mormon.
3. You search for arousal elsewhere
You find yourself increasingly drawn to pornography and strip joints, and not only for the chance to drink $10 beers and listen to "Wild Thing." The real issue, of course, is that you're no longer aroused by your partner. Perhaps you miss the spontaneity of when you first met, or maybe you can't get the image of her Days of the Week underwear out of your head. Whatever the reason, on those rare occasions you still have sex, you find yourself going through the motions, rushing through foreplay and finishing after only a few minutes (rather than the full five minutes you usually last).