I am 30 and my boyfriend is 42. Our intercourse has started to decline over the last few months to the point where he can’t seem to stay firm. He has a real issue staying firm if I am on top. It is starting to cause some serious issues in our relationship. He tends to do better when he is behind me but that makes me feel distance between us. He claims to be under a lot of stress at work. He never wants to have sex at night, only in the mornings and usually only on weekends. I am beyond frustrated. I have tried to talk to him and he clams up. Any advice would be greatly appreciated.