When you slap your girlfriends butt progressively harder to gauge how rough she likes it, aka her rough sex index.
Ricky was giving Vanessa a series of progressively harder Curiosity Slaps. When her "oohs" turned to "ows" he knew he had found her rough sex index.
The Rough Sex Index is the point at which rough sex is still pleasurable and not yet painful.
Vanessa asked Ron to use a series of Curiosity Slaps
to determine her Rough Sex Index.
© 1999-2015 Urban Dictionary ®
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