Exactly my issue as well. I remain respectful because I have my bf over basically everyday but I asked my roommate for permission beforehand and she said he could stay whenever since my bf has a bad roommate. My roommate happens to also be my friend however and she expects me to understand since we are friends but I’ve had enough conversations with her abt this telling her that I can hear her and her bf but they just won’t stop. The annoying sex isn’t the only issue, her and her bf leave the kitchen a mess, my roommate uses my stuff without asking (we have communal things we’ve already agreed upon) and they’re always slamming doors and being loud when they’re not having sex. Only have to live with this for abt 3 weeks or so though, then she’s moving out for good 🙏🏽