If Iron Bull accidentally got a Vashoth woman pregnant, maybe she wouldn't let him take the baby to the Qun. I mean, at that point, what are his choices? Fight her and maybe kill the mother of his child to take their baby away to the Qun? That seems like a pretty harsh line to cross. From what we know about Iron Bull, I don't think he would do it. He doesn't seem that fanatical and I get the impression he has a more sensitive streak in there. I imagine he would back off if the mother gave a hard no on taking the baby to the Qun.
But I doubt this would happen if he was an LI, honestly, and it's a pretty specific plot point. I worry that being the absent, obnoxious, drinky dad would put him dangerously into Oghren territory.