My (40F) daughter (16F) snuck into my liquor cabinet and hooked up with her GF. How do i deal with this?

My daughter is bisexual. She is allowed to have girlfriends/boyfriends, and there are no double standards when it comes to my rules on dating. All I expect is for her to be honest and open with me, especially when it comes to her same-sex relationships.Two nights ago, she invited her ‘friend’ Fran over for dinner/sleepover at my house. We all ate together, & I went to bed very early (8pm).I always check the security camera footage in the morning, and I saw my daughter and Fran SNEAK into my liquor cabinet, they got a bit tipsy. Then they started to hook up in MY living room. I stopped the security footage because I couldn’t bear to watch.I had a talk with them in the morning (they were mortified) and made them clean up the mess they made of my kitchen.I told my daughter we would chat more later when I have a day off from work, which is tomorrow. How do I approach this? How do I set more clear boundaries for her? How do I go about this? I want her to know that whenever she feels ready for sex, that’s fine (I’ve given her lgbtq+/Hetero sex Ed) but the underage drinking is a big no! And I don’t want to think of her having sex in my house. I also have other children, who are 9 & 10. My daughter is not setting a good example for them, thank God they didn’t go into the living room to walk in on their older sister.Tldr: my daughter invited her ‘friend’ over. After I fell asleep they got tipsy and hooked up in the living room, which was on security footage. How do I deal with the situation? via /r/Parenting https://ift.tt/2LJ6u7c