This is one of my sillier fetishes. I get turned on hearing a girl call my member a 'penis' especially as she first lays eyes on it or is playing with it. Maybe its the extra syllables, maybe its that a girl always sounds cute when she says it. It just makes me go hard.
A great example of this in porn:
http://galleries.pichunter.com/krawl/180/1802441/index.html Clip 1
A great example of this in porn:
http://galleries.pichunter.com/krawl/180/1802441/index.html Clip 1