He must have been one to father a child... there is only one way that happens...
If I have to explain the "birds and bees" to a grown man, the conversation is fruitless anyway.
I will put it to you this way. You are the first individual I have encountered who insists that the term heterosexual refers to any male who has been able to have intercourse with a woman on at least one occasion.
Have never observed a professional psychologist to use the term that way nor read a single academic paper that uses the term that way. And I have read a lot of them on this subject.