All in the genes

Research has shown that infidelity is hereditary. That must be the best excuse for playing the field. If I cheat on my partner, it is not because I want to cheat, but because it is hardwired into me from the genes passed down from my father, my grandfather and those before him.

In a way, it sounds correct... after all, men who can afford several partners (in the past) must be capable providers, and thus it makes sense to pass those genes down to future generations. But in the present time and age, with lawsuits and alimony, it only makes sense to stick to one partner. Having more than one partner gets you into trouble with lawsuits and ends up incurring huge costs (lawyers, alimony) and if evolution has any sense, it will be better to pass on the genes of those who stick to one.