After a rather intense or long sexual session with my BF I get very nauseous. I get so weak and extremely sick to my stomach like I have to puke my brains out. And sometimes like I am going to pass out. I haven't yet figured out what it is or why it happens. I know the weakness and light headed feelings are from blood flowing to other parts of my body.. but the sick feeling I'm still not sure about. Has this happened to any or you or your SO? Or does anyone have any idea as to why this might be happening? Thanks in advance.