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1.
having sex while a female is on her period
i took a trip into the red sea today
by jenni November 18, 2003
 
2.
sex while the woman is on her period
why is there blood on your bed
because dat dumb hoe din't tell me she was on her reds
by craig March 11, 2003
 
3.
When you're doing a girl and her vagina is bleeding.
During this week, it makes raw sex not only safe, but more enjoyable as opposed to with a condom.
Caution: Can be more messy than normal sex.
"Red sex last week was amazing."
by s4mthug July 12, 2005