Hey - I've had an infrequent problem (several months apart) during orgasm but it's taken me by surprise both times. The only common threads I can see is that I hadn't cum for about a week both times and both sessions were fairly long and intense. The first time I was standing up giving my bf a vigorous screw in the ass and the second time I was on my back with my arms above my head while he gave me a bj and played with my nipples, balls and asshole. (If you MUST know more details I can supply...) Anyway, the sex was great and the build up to orgasm was great but I don't really remember the actual orgasms because they were overpowered by blinding (literally) pounding headaches which felt like I had a ring of iron around my head and it was being struck with a sledgehammer with every wave of my orgasm. The headache gradually subsided as my heart rate went back to normal. Anyone know what's going on with that? Thanks.