Why does my daughter's father keep telling my daughter he wants her to be a ?

.....ok, so I approached dude (once) about having these inappropiate conversations with a child (10 yr old)he only sees about five times a year and rarely calls.He denied the incidents and called my daughter a liar.This (the same conversation) has happened about three times and I uming it will happen again.I am ready to put his azz on supervised visits.AND!!!!His "wife" is bi.*Do you guys think I will have to worry about that hag molesting my daughter?MAIN ?:How do/can I stop these converstions from happening?I really can't blame anyone but myself for reproducing with a total noodle!!!