I've known about my dd's sexuality since she told me at 14 (though I'd had my suspicions since she was much much younger as she was always a tomboy). I've found out recently that she's been dating one of her female friends - They'd been meeting up and talking much more regularly than her usual with friends so again not a surprise. She's been in a couple of relationships before, only about 6 months each but it's not her first time dating. One of them was with a girl too, so that's also not first time. Anyway, dd slept over at this girlfriends house recently and now wants to have her over and stay in her room - our house is overcrowded and that's the only way she can have people sleep over, even sofas are taken. Girlfriend seems like a nice girl and certainly makes dd happy (dd has been diagnosed with depression and anxiety so that's fairly significant) but I don't know how I feel about this still. I suspect they may be having sex anyway as dd is often at her house (in the UK so they are both old enough to consent), but I can't help feeling wary about my daughter having lesbian sex under my roof. AIBU to say no to the girl staying over?