Lately I've been waking up with a really sore body--particularly my upper arms and my thighs. I go to the gym a few times a week, but each morning after I workout I don't feel the pain--I've noticed it each morning after my bf and I have had sex. We've been dating for over four months now and we have sex almost every day. In the past, I've never had this...it has only come up in the past few weeks. Has anyone else noticed this in their sex lives? Or does anyone have suggestions as to what it might be?