I always get really sexually aroused around my boyfriend, but then, right when we are going to have sex, I lose it and I cannot make myself want it anymore. After we are done, I become very depressed and moody for the next couple hours. What is wrong here?
Or it could be that foreplay isn't long enough. You could try kissing and playing around longer before sex so you're really, REALLY worked up.
Or it could be that he's not that good, OR makes an ugly face. My ex made a horrible face and I'd have to keep my eyes closed because if I saw it, I would lose all interest imediately. *cringe*