I do believe if you put your mind to it you can commit to one person, but it takes a tremendous amount of will and determination. Four reasons monogamy can be so difficult.
2. Options. Chris Rock said it best, "A man is as faithful as his options". This can easily be applied to women as well. The possibilities are endless in meeting someone new to fuck. You can hook up in so many different ways, the Internet, at work, the club, the gym and on the subway platform on the F line.
3. Boredom. If you are bored or dissatisfied with your sex life you begin to obsess about sex. You constantly imagine yourself in more risque activity. The fantasy about that attractive UPS man that delivers packages to your apartment complex plays over and over in your mind. You contemplate ordering some junk just to get him to visit.