My boyfriend & I have been together for about a year and a half. We used to have sex all the time, but within the last couple of months its dwindled down to maybe once a week if I'm lucky. Sometimes he'll want to but I won't. I do it anyway because I enjoy being close to him & making him happy. But if I want to & he doesn't, he gets mad. He tells me its unattractive when i throw myself at him, but I don't know what else to do! I cant just sit around and say nothing. I try to turn him on & he just turns me down. Its a real downer on my self esteem. When I try to talk to him about why this is happening to us he kind of pins the blame on me or wont talk about it. I do love him & I know sex isn't everything, but I've heard the first thing to go in a relationship sex. I just don't know how to approach this. Is it my fault?