Board Thread:Lore Discussion/@comment-27973159-20160315225034/@comment-34660304-20170302120525

A "Child" of Coldharbour is someone who is raped by Molag Bal and, if they survive the ordeal, are turned into a pure-blooded vampire. There is no record that indicates that Molag Bal has ever raped a male mortal, so "Sons of Coldharbour" possibly do not exist.

However, men can become pure-blooded vampires. Harkon himself is one, as he was granted vampirism by Molag Bal himself. Whether Molag Bal raped him to achieve it, is unlikely.