I like when my partner cums inside me because there's this closeness we feel, and it's his cum, and there's just this super strong primal sort of need and desire for it that makes it feel wonderful.
Now, when I think about it, that primal need and desire is probably part of an evolutionary drive to breed and procreate yada yada. So, in that sense, yes.
However, when I actually *think* about it getting pregnant, I do not find the thought appealing or sexy at all. It elicits a strong DO NOT WANT response. In fact, if I bothered to think about it while having sex, I'd probably have to stop (having sex).
Now maybe that will change when I'm "at the age" where I want to have a kid, though I can't imagine that lasting for longer than the moments when I'm actually trying to have a kid. And I think the only reason men find pregnancy sexy is that evolutionary possessiveness and proudness they get when their all powerful sperm finally get put to use. I "get it" but still... lol *rolls eyes*