I know I'm not female but I'll chime in.I agree with what WildHoney is saying.Once the trust is broken,it is very difficult to build again,if at all.
When you cheat on a partner,you're saying you don't respect your partner or the relationship enough to work out whatever made you stray anyway.If the relationship is fine and you still fuck around,then you're just a sorry individual,and you need to examine yourself and why you feel the need to seek comfort(and sex) in the arms(and between the legs) of someone else when your spouse is at home.
I personally have never cheated on any of my SO's,and if we had problems that couldn't be fixed,I'd break off the relationship first.When you have sex with someone outside the marriage/relationship,you're potentially exposing your partner to god knows what.
Besides,why live in deceipt? It takes more energy and effort to keep up a lie than it does to just work on whatever issues you have.I like things simple personally,no time for games and bullshit.