And THAT is why you discuss limits in advance.
Would I get a married woman/couple pregnant? ABSOLUTELY and have. For the right reasons and with the knowledge of all involved there isn’t a greater pleasure.
But just for kink is NOT a good reason.
In my experiences, I was asked to sire a couple of kids for a lesbian couple I went to college with. And years later for a couple who couldn’t conceive because of his medical issues.
Although we did add a level of kink to this, it was always with the intention of getting the Mrs pregnant