Dorian specifically did not want to compromise his identity for the sake of his family lineage. An irrational choice? Definitely. But not an unbelievable one in my view at least.
Not unbelievable at all! As a woman who has chosen not to have children, if my family had tried to force me to have kids I would not have been even slightly tempted to comply. My choice, I'm sure, would have been a lot harder in different societies, and indeed in different families within my society, plus my family certainly has no dynastic power to preserve, but I feel a very visceral horror at the idea of being forced to have a child against my will. I guess it could be argued it's not as big a thing if you're not actually the one giving birth, but it's still plenty big if you take your responsibilities seriously and, even if you take the question of kids out of it, the idea of being pressured into having sex when you don't want to is pretty repellant too.
Perhaps, as you say, there is a Tevinter equivalent of a turkey baster (or the baster of a Tevinter equivalent of a turkey?!) that could be used, which would eliminate the unwilling sex element of it, if not the unwilling parent bit. But even then Dorian would only have reason to do it if he particularly wanted to prop up the existing power structures in Tevinter, including his family's role in them, and I don't think that's something he's up for anyway, even if it didn't involve making sacrifices on his part. If he'd valued Tevinter society in its current form and felt it right to support his family's position in it, then he may well have made some different choices. But then, if he hadn't felt some tension between the way that society worked and his identity then he may never have questioned it.
Anyway, I've got interested in a tangent again, so apologies for another off topic post!
