1. Derelict hates the "male form," whatever that means, so he'll only add males if they don't look human. Male orcs are planned as well as a male blessed centaur.
2. The off-spring are nephelym stuck in the void. The whole impregnation/pregnancy process is just a fancy summoning ritual. The purple elf right outside the house talks a bit more about this.
3. Nothing confirmed, but since he's going to be working on sex animations for the next few builds, it's a possible future feature.
A few corrections from my realistic point of view and from what I got:
1. Derelict doesn't really "hate" the "male form", but he is simply bad at making it (or at least he's not satisfied with his own work on that part), so he hates "making" it, because the results are always bad in his opinion, so he almost never makes males. He has males planned for most races, but the answer to the question, when these are going to be implemented, might be "never".
2. From a non-lore perspective: Dere refuses to implement anything that looks loli, so there will never be offspring in the young stage in the game. It's already impressive, that he implemented goblins, because if you set all their settings to "normal" (i.e. 0.5 on every almost scale) you literally get a loli elf.
3. Unlikely, since he focuses the game strongly around breeding (which aside from his disliking of the thing in general is his main reason for not implementing gay stuff) and you cannot breed more offspring while already pregnant
Like I said before, game needs a "anime on/off" toggle.
I still do not get, what's with this general hatred for "weeb stuff", that seems to be an absolutely unique trait of people from the USA. Don't get me wrong. Of course there are countless people in the US, that love anime. However, in no other country on earth I have experienced so many people, that call anything that looks remotely like anime "weeb stuff" with the connotation of "i hate it, because it's weeb stuff", than the USA. Nowhere else I've seen people, that judge a book by it's cover so much like in the US, when it comes to anything that remotely resembles anime.