pmphobia
In the IRC (Internet Relay Chat) world PM-Phobia (PM=Private Message)is the fear of unsolicited Private Messages particularly those of a sexual nature.
Hey baby can I pm you for a second, "No, I got pmphobia" get lost. i.e Hey hotty want to see my *bleep* pm me and I'll give you the password; no, and thank god for my pmphobia.