secret sex??

my bf and I recently got in trouble for having sex and I'm being forced on birth control by my parents and his parents removed his bedroom door. they put up a curtain so he can have a little privacy. I'm allowed in his room with the curtain shut. his room is in the basement but his parents come down often to use the computer. I personally feel like in my relationship sex brings me and bf closer and sometimes I want to feel close with his like we are connected. ANYONE HAVE ANY TIPS ON HOW TO STILL HAVE SEX WHILE BEING QUIET OR SNEAKY?!