Mum cheated

Why should anybody want to have a last bit of fun before getting married? Surely if you're committed to someone, you're committed to them - you DON'T go looking for a last bit of fun before getting married. If you want fun, you shouldn't be engaged, or preparing to get married.

If this scenario is true, then the mother did blatantly cheat on her fiance, and it's not harmless at all.

Geez if I was the bloke and I found out my fiancee did that before our wedding I would call off the whole thing. It's completely disrespectful. Cheating is cheating - I can't see how it can be justified in the slightest.

I think you might have misunderstood me - I'm just saying it brings up the old point of sexism.
I'm not saying I'd condone a guy doing this either.