(@Leonidas) There is no in-game sexual abuse (not in Vanilla, anyway, and I don't know if you're aware of the Modding discussion that got expunged), nor indeed any actual "Tab A goes in Slot B" stuff in the procreation side of thing, that gets revealed to the player, anyway.
So if that dwarf female takes it any further than merely emoting on the subject, it would have to be a reciprocal relationship, as things stand
Which you then suggest is a step on the path to rape (assymetric consent), prostitution (can be consensual[1] but often isn't, at least by ideal circumstances) and bestiality (totally assymetric consent if it it involves a non-sentient 'partner'[2]).
If you think there's eroticism involved (beyond mere words of preference in a dwarf psychology, and perhaps a rather tame Lover/Spouse entry in the relationships table if it is reciprocated, perhaps leading to a child magically appearing with (horror of horrors) parents.... Well, you're easily satisfied. Or repulsed. Either way, it was your trigger that seems to have been fingered, from what I read of this thread before I eventually decided to post.
DF is never going to be "about sex". It can (and is) about legacy and descendents, which is indicative of sex, but then so is your very existence in The Real World™. I hate to break it to you, but your parents[3] had sex. Which makes you the embodiment of erotic? Your grandparents even had sex with each other (or maybe not each other, but someone had sex with someone else, maybe not necessarily (always/forever) the appropriately paired grandparent. And so it goes on.
What's more, there's a good chance at least one of your Greatn Grandmothers didn't just have sex, but she had sex with a Neanderthal... Or if she didn't, it's overwhelmingly likely she was the Neanderthal in that relationship. And it is ironic that it is descendents of such lineages tend to be the "not one drop" ideallists who would forever condemn a 'mixed-race' marriage with the group of humans less likely to be genetically part-Neanderthal.
So, sorry, but I think you're completely off-base with this one. No, I'm not looking for DF to turn into a pure FurryFic Fantasia, or even "Leisure Suit Larry with Elves". (The thread title doesn't even hint at that, and that which is written within is no Penthouse Letters page) Not that it couldn't be, but it wouldn't become that with just this change. Like the Took family of Hobbits having a tale told of Fairie blood in their veins, there may be a suspicion (by the time history is progressed to game-time) that an ancestor took on a wife of some other kind than what they ostensibly are, maybe. Or you do find a half-Kobold, half-Dwarf, but that's just an interesting character, not an erotic/kinky/perverteddelete as inapplicable scene playing out in real time on your monitor in glorious ASCII.
But if you're still thinking otherwise, I'll leave you to your thoughts.
[1] And involves a form of sexual polygamy that doesn't exist at the moment, plus an Economy of some kind (currently out of the game) to make it a viable trading proposition.
[2] If you're extending to Animal People, then it's just exactly what is suggested. Mixed-race attraction, only actual 'race', rather than the melanin-prejudice kind.
[3] The biological ones, at least, if you had any other kind who did the co-parenting but for some reason didn't/couldn't entertain the thought of the initial step in the process.