Mum won’t allow sleepovers

I’ve been with my boyfriend since we were both 15 and we’re now both 17 so just over 2 years. We were each other’s firsts when I was 15 and he was 16. I didn’t tell my parents and went and got birth control myself (because I knew how they would be). They found out I was having sex and went mental, even though I had sorted going on the pill myself. 2 years later and we still haven’t had a single sleepover because my mum just won’t let me. She says “it’s not right” and I’m “only 17”. I really just want to spend a night with him and wake up next to him, it’s not about the sex at all. We have sex all the time so sleepovers won’t change a thing which is what I don’t get. At the start she was funny about having my bedroom door open if he was in my room and being home alone and things like that but now she’s fine about that and has been for a while. She knows we have sex regularly she’s not stupid. Everyone else my age is allowed sleepovers and it just seems so unfair. I don’t know what to say to her because she’s so strict about it but I would just love to spend a night with him. Can anyone give me some ideas please? x

Update: I mean she won’t let me sleep over at his house, I wouldn’t expect her to let him stay at our house that will never happen. I do understand where she’s coming from. Can those of you saying you agree with her give me some reasons please so I can talk to her, I don’t care if you agree I want to know why so I can try and change her mind. I won’t be moving out at 18, I’ll be going to university where me and my boyfriend will most likely break up, he’s so special to me and I just want to make as many memories with him as possible.

I’m asking for help not bitchy opinions about me, my relationship, and my level of maturity. Thank you to those of you that actually gave the response I asked for without slating me.