Cheatings a weird topic, 1st of all why is it the 'done thing' to be with one person (religious influence im guessing), when (as it happens so much), humans are just not designed to me monogmous?, everyone to one level or other feels like they'd wanna just jump on someone else at some point in a relationship, weather they do it or not is another thing.
Also I guess in relationships one person or the other 'wears the trousers', or is the more dominant one (not in a dodgy way ! lol), more often than not iv seen this 'more dominant' character be the one that plays away from home.
An interesting insight into human behavoir cheating is, humans a, such random species,lol