Then you probably never heard that God came down to earth as a human and had sexual intercourse with Mary either.
I think you are stretching things a bit. mormons adhere to the arianism view of jesus(from what I understand)...that is that god CAUSED mary to become pregnant with jesus(presumably by willing it to happen, not by physically having intercourse with her). Mormons didn’t invent this idea. the ancient goths had this non-trinitarian theology also.