Women do it too but why depends on the person
Alot of women cheat to not just guys
Guys that do that are just thinking with their d!ck
most guys r all dim,,,, see their neighbor's grass always more green than theirs.
U add in wife grows old,, which for 80-85% of USA girls means 2-3 x's d dress size when we married them,,,, omg,, d grass IS greener on d other side of any/every fence,,,
Well it's kind of like Eve and the apple if you can't have it you want it more
because they ask us politely ?
To expand and refresh the gene pool...why else?