>>11485 (OP)
Crossbreeding? Well humans and twileks can produce hybrid offspring together. Most species that posses similar DNA can reproduce in SW. All Near-Humans can mate with Humans, but not all Near-Humans can produce hybrid offspring with Humans, although the majority can, but the minority that can't have basically deviated too far from baseline humans to be able to make offspring. Humans can also produce offspring with a few non Near Human species, despite clear genetic and physical differences, as long as they are at least humanoid in form (probably due to genetic similarities), but overall, if a non-near human has a somewhat humanoid shape and a humanoid head, then it may be able to make babies. Twi'leks however can apparently reproduce with any species as long as its humanoid (and has the standard humanoid naughty bits for obvious compatibility). Humans, Near-Humans and Humanoids that couldn't reproduce together can find ways around this by genetic manipulation, making each other compatible. Presumably the same might work for lesser humanoid species, but they end result may be a bit abominable. Cloning and test tube babies is another method of making decent hybrids of many species without risking something going wrong after the initial fucking. For example, Half-Bothans, the result of Bothans and possibly the humanoid elf-like Sephi, but even that stable hybrid of near-human and barely humanoid had its weird results, having been born with hooves and horns, possibly genetic throwbacks or some shit. The same things above likely applies for non-humanoid species as mentioned in a few rare cases, Duros can reproduce with other Near-Duros and possible Durosoids, etc etc. Also, suffice it to say, if we're talking about just plain old fucking, then yes, a lot of species could fuck one another regardless of species as long as they knew how to pleasure one another and had the drive for it, like the vile love making between that Gotal and H'nemthe from the cantina, as males and females across all bipedal species usually have similar reproductive organs and thus the sausage can usually fit through the donut regardless of shape, but the feeling will vary, its about how its used I guess. For example, you could fuck a female Mon Calamari, but that fucking thick scale-like skin would scrape like a bitch.
Finally, hybrids are usually seen as freaks and ostracized by the rest of the galaxy, unless they can hide the visible signs of their hybrid origins, such as weird skin pigmentation.