I’m new here so sorry if this is the wrong forum!
My teenage daughter, 17 is with her partner, 19 and has been with him for years since she was 14/15. He is a very respectful, lovely lad. They seem very happy together (yes, they are young!) but it is still nice to see! His family are wonderful to her. Young relationships can blossom I guess..
Anyway, the problem is, of course I know that teenagers have sex. It’s part of life, I’ve been there etc. However, when he is round I feel like I’m getting lost in my own home as I try and give them some privacy in the living room, or kitchen. I have tried going upstairs keeping my bedroom door open and letting them have downstairs, and keep checking on them.
However, my daughter isn’t a baby no more.. and she’s at the age range of having a serious sexual relationship.
I use to say no to sleeping in the same room. Should I let them? I’ve started to say yes to being in the room alone in the day, with the door open and I have told them I’ll be checking and if I hear anything it’ll be the last time he’s over and I’ll pour water over him! 
Am I being unreasonable? I don’t want to seem like an old fart but I want her to have respect. I’m very open to her about sex, though.