I don't think it's your parents' or his parents' business whether or not you are having sex if you are no longer a minor. My husband and i had sex in the homes of our parents before we were married and I know they would disapprove. Of course we didn't announce, "We're going to go have sex now" nor would we now even though we are married. Our sex life is our sex life and no one else's.

Both of our parents are extremely opposed to sex before marriage because of religious reasons. Funny thing about it is we've done the math and found out both of our (judgmental) mothers were pregnant before they were married.