I've known two guys who actually found heterosexual intercourse quite riveting as long as they thought they could be making a boy at the time.

Needless to say, they weren't great friends of condoms or the pill in their hetero affairs. It was thinking about the boy they could be creating that gave them the big orgasm.

Your post doesn't indicate whether or not your thoughts might be heading in that direction. So none of this may apply to you. Your post just evokes this possibility by touching on its edges.

My own feeling is that heterosexuality purposed for making boys for a BL to nurture is using another person as a means to an end. Unless the woman knows the score from the beginning.