Sometimes, you or your partner may need to fantasize about someone else to become aroused and stimulated. More than four out of 10 Americans enjoy sexual fantasies and erotica to boost their libidos. As with most things in life, moderation is key. If you are fantasizing about someone else every time you are with your partner in an intimate way, then there is a problem. What needs to be explored is why you aren’t fantasizing about your partner. Does your partner still stimulate you? Are you still attracted to him? His body? His scent? By not discussing these issues together, you are being dishonest with yourself and your partner regarding the true state of your relationship.