My daughter is 13 and I am very discreet with my partner. Of course, she knows we are in an intimate relationship ... but I'm the adult and healthy boundaries are important. My kiddo doesn't need to "hear mom" in bed, etc. We've talked about sex (basic facts, etc.) and she is not sexually active at all - but I just think it would be inappropriate and unfair to her if I wasn't mindful of timeliness for intimate moments with my partner. I'm divorced and live in much smaller quarters now (apartment) - so when my daughter is with me...sex with my partner isn't part of the equation during those times.