Eveille
Keltoi Samurai
Eveille
Actually sexual relations might well be impossible. There is the case of a particular beetle in Australia (was taught this in school a while back, so the details are fuzzy
sad ). Anyway, this beetle species had 2 populations that had recently been divided by a highway or a canal or something. One population the females like beetles with big horns and big penises, the other population had selection where being a small beetle was better and would let them live to reproductive age more successfully.
The 2 populations had such intense sexual selection that now the males from the side with the big penises cannot mate with the females from the other side because their hole isn't large enough and cannot possibly stretch (yay hard exosekeltons!).
Point: If they have exoskeletons, we might not be able to do anything at all.
Moving on, if we found squishy humanoids like us there might still be a bias against it just as there is a bias against having sex with great apes, no matter how alike we look or act.
don't forget the possibility that their body chemistry might be sufficiently different from ours that our fluids might be toxic to them and theirs would be toxic to us . . .
. . . sorry, playing a lot of Mass Effect lately.
Never played that game, but it is a possibly valid point anyway
I'm currently playing 2, and one of the romance options ( the one I'm going for ) is with an alien with a DNA structure so radically different from humans that fluid contact could be dangerous between the two.
there's another species with a similar genetic structure to the one I mentioned, and it's flat-out stated that if a human tried to eat the same food as them, it'd kill 'em, and likewise for the alien eating human food. even have to have different intoxicating beverages.