If you see a particularly good looking person, with pecks and abs and six pack etcetc. then you can call them 'sex on legs'. They give joy to your eyes, and, in this way link to sex. Just not in bed, but on legs.
Alice: WHOA, LOOK AT THAT FINE PIECE OF sex on legs.

Fred: YESMATE, I WOULD EAT THAT FOR DINNER.
by nomnomnom1278478373 October 3, 2010
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a compliment to someone who is very attractive, often shouted out
whoa! sex on legs!
did u see that babe?...yeah she was sex on legs!
by devilboy December 3, 2004
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someone who embodies perfection, personifies attractiveness, and oozes vibes of "do the nasty with me"
Did you see Brendon Urie, Conor Oberst and Julian Casablancas last night?
Yeah! Them boys were sex on legs.
by kaaate January 27, 2007
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-noun

One who personifies sexual attraction.

Perhaps British in origin.
Ginny eyed Ron pityingly. "Sorry, Ron. Hermione discovered Severus is sex on legs. Best to move on."
by Journeymom September 22, 2006
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Ville Valo;

used to describe somthing VERY hot.
*in bar in helsinki*
chick 1: holy freaking god that's VILLE VALO!!!
chick 2: OMG he's sex on legs!
by love-bruises March 7, 2007
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nickname given to American Idol 2006 winner Taylor Hicks because of his ability to make women go through entire packs of panties just by looking at them sideways or playing with his harp.
by Maisie M. December 22, 2006
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