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1.
Indentations in the hips caused through muscular definition in the torso. When a person is wearing low-riding pants, the indents look like two lines pointing down to the genitals in a "V" like shape.
Steve only wears his pants like that because he wants to show off his sex lines.
by jonjon84 June 26, 2006
365 139
 
2.
the beautiful markings cut into the flesh on the lower abdomen of a fit male (or an extremely fit female).

They can be found on people such as Pete Wentz, Usher, and Kelly Clarkson.
He removed his shirt and when i saw his lovely set of sex lines, I pounced on him.
by Shelby Renee March 31, 2006
224 122
 
3.
Sex line: a pickup line so good that it gets you laid.
A classic 'sex line' example:

John: I wish I was one of your tears!
Susan: Why is that?
John: So I could start in your eyes, live on your face and die on your lips!
Susan: Your place or mine?
by supanover_ek_sez October 14, 2010
10 15