AITA for not saying anything about the underwear?

My 20 year old daughter and her fiancé are currently staying with us. Apparently my wife found a pair of my daughter's underwear under their bed. <br><br>Now my daughter and her fiancé are in this weird trend where they don't have any sex and are 'waiting' for marriage. My wife and I aren't really believers in that but we aren't going to stop them.<br><br>Anyway my wife confronted me about the underwear asking if I knew anything. I told her I didn't but it's not like we're stupid and don't know what's going on. My wife told me I should say something to my daughter about it being 'disrespectful to do that in our house' and to remind her 'of her values'. <br><br>I told my wife she has no business going through their stuff and that if our daughter is having sex it's not my job to tell her not to. <br><br>My wife is really upset saying that I'm not enforcing our daughter's values and I'm supposed to be the one teaching her about it. I told her it's not my job to police her sex life just because she's living under our roof.