Sakto ni nga rason ngano mura'g "lesser evil" mangabit ang laki kaysa bayi. Most male mammals have a genetic predisposition to propagate. Sa ingon pa "Go forth & multiply". Some even say nga kadtong mga lalaki nga "stick to one" are doing things wrong & are defying their genetic nature.
Sa mga babae, naa pud sila'y ilahang genetic predisposition which is called the maternal instinct. Mas nurturing, mas caring ang mga babae & they tend to get attached to a relationship kaysa mga guys. However naa'y mga babae nga mu-defy pud ani nga predisposition & they follow the propagation path. Pasabot kadtong mga babae nga daghag partner at a certain time. Kaning mga bayhana, nahimu nang mga "pariah" or outcasts in society. Mas naa'y tendency ma-condemn sila kay it's not what is expected of a woman.
In a nutshell, most guys get away with cheating & girls wouldn't because of what society expects.
I'm not saying this to justify why guys cheat on their girlfriends/fiancees/wives. It's still not right to me. All I'm saying is that to the guys who pull off a maneuver where they have multiple partners (& if lucky, all at once) they are just facing & dealing with biological facts that are beyond our control. Sa mga stick to one guys, even if you're told that you're doing it wrong, I still salute you for your fortitude.