Not enough

So my boyfriend and I are 18 and have been together for 4 years. We first had sex when we were 16, and I often snuck into his house and that’s when it happened. I got caught by my parents sneaking in once and now I definitely can’t anymore because of cameras and so on. Because of that, we can’t have sex very often at all because I don’t like doing it somewhere that’s not completely private. Us not being able to have sex has made him feel like I’m less attracted to him sexually since we used to do it often and now it’s once every few months. Any advice on what I should do?