Why is the pelvis area a turn on?

So me and my girlfriend (she is a year younger than me we were on the couch watching TV and I stuck my hand down here pants she said she wasn't comfortable with it but I told her to just stop me when she gets to uncomfortable and she agreed so she stopped me right at the end of the pelvic area, and I started... show more So me and my girlfriend (she is a year younger than me we were on the couch watching TV and I stuck my hand down here pants she said she wasn't comfortable with it but I told her to just stop me when she gets to uncomfortable and she agreed so she stopped me right at the end of the pelvic area, and I started rubbing her pelvis and she began to moan and eventually she climaxed.
Why did the pelvic area make her *** I didn't even touch her clit?
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