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1.
1. When your body reddens during an orgasm and shortly after it. You'll see red spots & striped all over your stomach and chest area.

2. Less popularly used to a woman when she gushes out massive amount of squirt during her climax. Just like how a toilet flushes water.
I was fucked so good where I flushed heaps amount of squirt from my pussy!

My body has been sex flushed! Look at the red stripes all over me.
by boxes above October 25, 2011
 
2.
Maculopapular type of erythematous rash.
Masters and Johnson, in their book “Human Sexual Response,” wanted their work to be taken seriously, and wanted to stay a step ahead of the morality police, so they tended to write in almost comically dense medicalese, such as mounting episodes, stimulative approach opportunities and vocalized performance concerns. A sex flush on the stomach was a maculopapular type of erythematous rash. (New York Times)
by tokugawa227 June 26, 2009
 
3.
The equivilant of that good feeling you get when you flush the toilet after taking a really massive dump; almost erotic.
Man, that superbowl party was such a sex flush.
by Spigget February 03, 2009