My boyfriend and I have been together for 3 years and are both in our early 20's. For some reason in the past few months we both don't have much of a sex drive at all! We live together but we used to have sex at least once or twice a week. Now it's been 3 weeks and we haven't had sex!!!! Is this normal? We both love each other, and I know I'm not seeing anyone and I'm 100 percent sure that he isn't either, so what is it?