I am 22 and my parents won`t let me sleep over my boyfriend`s house?

first of all you need to understand that you are 22, that is 1 yr older than the adult age that is recognized worldwide - with this, you are mature enough to hold responsibilities and have your opinions considered, thus sit your parents down, talk to them as if you were not their daughter ( remember, respect is the key) when I say talk to them as if you are not their daughter, i mean talk to them as if you are not related, this will give you confidence and you wont bit around the bush to get your point out there. Sometime people get to be tongue tied when it comes to their parents. Nevertheless I don't really know what is the kind of relationship you have with your parents or what is making them not "trust" you to sleep over at your boyfriend - but one thing you have to keep in mind is that, they care deeply about you, and as parents they are over-protective, and that's how it will forever be, but that doesn't mean that you can't assure them of your safety and earn their "trust"using words so as to comfort their parental guards. - REMEMBER its not necessarily about you, it might be the guy, so before you say you want to sleep over at his place, invite your parents to his place for a diner, let them see and feel his intentions and domicile, with this trust will be built and you can always pick up from that. and if this doesn't work don't give up, they say if you settled for what you got, you deserve what you get, so find ways to make them understand that you are mature enough and your boyfriend is not a "serial murder" hey perhaps they heard rumors LOL