Probably nowhere is the teaching of the church more explicitly in conflict with the values of the society in which we live than in the area of sexual expression. If we watch our prime time television shows or top ten movies, read popular books and supermarket magazines, we see a very clear and consistent message being presented concerning sex. Sexual desire is natural and should be fulfilled. Don't deny yourself sexual pleasure. Sure, some sex is better than other sex.
Some partners are better than others.
Overall, though, any kind of sex is better than no sex at all. Our culture at the turn of the century has lifted erotic love and sex to become our idols. The only place you don't see sex in the movies is between a married couple. It's almost like sex is unnatural between a husband and wife. It's much more natural and fulfilling to have an affair.