I've done the sciencing up on the assbabies part of it, and if you want medical journal links of the half-dozen documented historical cases of assbabies I can probably still find them for you. And if you're going to have assbabies, self-lubing only makes sense (there is already a certain amount of natural anal lubrication, so it's not unreasonable to assume it could be increased enough for sexual purposes.)

Evolutionarily speaking, though, it doesn't really make sense to have universal bifertility + two distinct sexes - I mean I could postulate a species where it *did* make sense, but it wouldn't look much like the AU in most of the stories; frankly I tend to pretend there's a backstory where genetic engineering was involved. And the strict dominance hierarchy and the stuff that goes with it, I got nothin' for. If I was writing one, I think I'd make the dominance hierarchy a purely social artifact that the people only think is biologically mandated*... but neither cultural subversion nor gender theory seem to be what most of the Α/β/ω authors are going for, from the limited amount I've read.


*in fact come to think of it I am playing with an original species at the moment with four genders, only three of which are biologically distinct, the fourth being a social construct based around who chooses to be a bearer of children.