When you are in a relationship what can't you do with the opposite sex?
Most Helpful Guy
All sexual contact (making out, vaginal, oral, grinding/twerking etc) with anyone other than your significant other
I'm sure there are more. It's almost anything that you wouldn't want your significant other to find out about. Plus there are things that are going to be a little touchy for each person. Sharing intimate details that your partner wouldn't want out is a betraying their trust as well.1