He gets what he NEEDS but not what he WANTS. THe man who does this is self-centred, loving his own pleasure more than he loves his partner.

Maybe he doesn't get everything he wants from one female.

He's in to quantity as opposed to quality.

he has some screws loose i used to chat with this guy from staten island, his wife was gorgeous but was an ice princess in bed, he told me how he had girlfriends.... i sure hope your hubby isn't named Ben

Looking at nature, you can tell that the male of a species was never really designed to stick with just one female. I'm not saying that's right or anything but Human nature is just the same. We all have tendencies we have little control over and unfortunately we always think the best way to get rid of those urges is to indulge them immediately. Most break-ups happen that way.

Men want their cake and eat it. Men, in the final analysis, want what they cant have. It is the chase that attracts them, but I'm unsure its any reflection on the women he is with.

well in most cases man do get everything they could possibly want from just one female but thats is not enough to them. they feel that when one girl is giving them all they want, they think they have the power. man feel in a way that if they are not with more than one female that they are not really man...they want to feel powerful and desired...they believe that its their species to this. its really stupid in a way because alot of man are willing to give up something amazing that they have at home already. man also have an ego, they have a king ego. they see something and they feel they must have it...if they cant, their ego goes down, so the more woman on their castle the higher the ego.

curiosity, boredom, competition, and just wanting to know we still have the option

I thnk some men but not ALL are this way. Some men think they can't have their significant other do some of the things they want done. They may not want to ask for fear of rejection or that they will get laughed at for asking. But the main reason men tell me is Variety is the spice of life. That sounds bad and women do not deserve it but it does happen. I also think it has to do with the fact they are getting away with something.

Some part thrill seeking, and some part just to know he can still be looked at as attractive by more than his wife. Having another lover is definitely risky, and to some people, they really get off on that.

Among the most common reasons men attribute their cheating habits to are; boredom, insecurity, loneliness, and the need for variety. Men who cheat because of boredom are not happy with what’s going on in the bedroom. Their partner could be less experienced, not very creative, or simply content with a monotonous sex life. For those men who are sexual gurus, this is simply unacceptable and ultimately drives them to seek someone who will fulfill their sexual needs. Sex is a key ingredient in many relationships today, and has a history of ruining relationships as well as marriages. Some men try to hang in their relationships in hopes of improved sexual activity but to their dismay it never improves and they opt to cheat instead of leave. Sometimes a man likes to know that he stills has it. After being in a relationship for a while, a guy can become skeptical about his game. Guys love to relive the “glory days” and often reminisce about how much of a player they use to be in their “prime.” This often leads to the question of whether or not they still have it and in order to answer this question a, man might try to befriend a female to see how long it will take them to sleep with her. As immature as this may sound, it is not an uncommon reason; in fact it is one of the most common of them all. The male ego is a monster, it is nearly undeniable and has a great influence on what a man may do. Loneliness is another extremely powerful feeling that it can be a very punishing emotion. As far as relationships go, this inadvertent form of punishment is generally a reason why men cheat. It plagues long distance relationships which lack ample quality time, or where there is lack of communication. By not having the ability to interact with their counterpart, a man begins to feel as if he is lacking something and the “thought” of that special person is no longer enough for him to remain faithful. Yet the main catalyst behind a cheating monster is the need for variety. A man can have a woman with great qualities, but if he comes across another woman with great qualities but different traits, he tends to desire her more, simply because his curiosity excites him. Once attracted, like a dog in heat, the guy must pursue his goal in order to fulfill his desires and be content with life. For a man who needs variety, the slightest differences in women may cause a tame dog to bite and devour everything within his grasp. (http://www.johnsonmedia.com/aucmag/getarticle.php3?id=april_2006&subid=24)