I think it depends on the why. I have Cystic Fibrosis, which has a 98% infertility rate among males (edit: not so much infertile as much as CF gives you a built-in vasectomy). IVF is an option, but my wife's age (36) means the clock is ticking and nothing is guaranteed. I can't speak for her, but I'd like them, but have put myself in a place where my life's outlook isn't defined by whether or not I'm ever a parent.