Do not want.
Jesus Christ, can anyone keep it in their pants anymore?
First it was Tiger Woods. Now it's Mr. Sandra Bullock and reality TV staple Jesse James who's seen an array of tattooed women come forward and say he liked to have unprotected sex with them at his office.
I'm all for having as much sex as you can possibly get while you're on this planet. Sex, along with hot pizza and House Hunters marathons, is one of the few pure joys we get as humans. But everybody just needs to be up front about their proclivities, predilections, and desires.
But, as my grandmother always said, you should not make promises you can't keep. If you go on cake tastings, rent a church, and do the chicken dance with a lady and you promise to her that you will be monogamous until one of you dies, then don't put your dick in other women. Or, you know, maybe hold off on that marriage thing until you get tired of putting your dick in a lot of women.
And for fuck's sake: If you are going to have an affair, at least bag it, dude. God.