On the one hand, I love my wife more than I can say, and logically, done is done, we already have children. I have had a vasectomy, so we won't be having any more, so perhaps there is no harm in continuing as we are. But, I can't help but think "This is my sister" every time I look at her now. I haven't said anything to her yet, and I don't know if I should or not.But the best part is that, apparently without realizing the pun, this "Dear Prudence" starts her answer with, "This is a seminal question about the nature of assisted reproduction." Really? Seminal?