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1.
Anything that is wicked good. Connotation to the positive.

Word trend started by a certain "Marie O."
Marie is pure sex.
Norman is not pure sex.
Chinese food is very pure sex.
by Marie September 08, 2004
 
2.
When something is really really well performed, well shown, or is very good.
"John, that perfomace last night was pure sex!"

"Susie, that skateboard trick was pure sex!"

"That's pure sex man, pure sex."
by Pablo99 December 21, 2003
 
3.
This describes something that is cool. Sometimes preceeded by "teh".
Oh my god, that ferrari is teh pure sex!
by Deano 177 February 19, 2009