Originally Posted by RRRED

You should tell her you have a sudden business trip and go as far as have her take you to the airport... then she's got her date that night and is all careless cuz she thinks there's no way you'd be home.

A) Plant a camera in your bedroom. It's legal to do if it's YOUR bedroom. That'll be nice not to get arrested after you send the tape of her having sex with some other guys to every single person in her family and social circle for Christmas.

OR'

B) Just walk in the bedroom with a pair of scissors while they're having sex, act like you don't even notice it, and go straight to the closet and start calmly cutting up her clothes.