Is my mum being silly or what?

I've been with my boyfriend 11 months and were both 17, My family are Christan and so is his family. My boyfriends parents don't mind what we do or anything, but my Mum doesn't want me to sleep in the same room as him or be in a tent together with friends out camping, But I'm aloud to sleep in the same room with other girls and go out with friends to party's but not with guys only girls (not even my boyfriend) and I think it's just stupid because when I ask her if I can sleep on the floor and my boyfriend on my bed she says no because we might get tempted and have and stuff. Me and my boyfriend don't believe before marriage is a law or anything and we only do it if we are ready. I just think it's just stupid because you could just do the same with girls, she's like putting the boys stereotype of 'only boys want ' I don't think that at all to be honest. advise please? thank you.