Ha! I had to giggle about this. I am so pale--and I get this too. On my neck and cheeks mainly.
Its normal for some people. Prevention--don't orgasm?
Hiya, I think it's called an adrenalin rash. I get red rashes on my chest after really good sex and also at times when I'm really angry! Like redneckmom says, youre guy probably loves it, mine does! although you wont be able to get away with faking! Hope that makes sense to you!
I haven't heard of anything you can do to stop it. Although why would you? I feel this is nothing to be ashamed of. While I don't get this I know plenty of women who do. Yep that's right, you aren't the only one. Many men think it is hot because they know that you had an orgasm and they don't have to wonder one bit.