Panties and masturbation

Why is it that guys love to masturbate with panties on their cocks? What is the fascination to have them on their cocks? I received a call from this guy who stole a pair of panties just to sniff the panties and then masturbate with them on his cock. I asked him who they belonged to and he told me. I told him that he was a pedo and that he needs to just make his move. He just needs to understand that he has issues and needs to deal with his little inchworm issues.