Never really thought about it, but what would make the most sense to me as far as Taxxons go would go either A) a queen type setting, where the queen lays larva, (and, with them being cannibalistic, would explain why they like roaches so much.
), B) using a medium, and infecting them with young like the parasitic wasps Kev mentioned, or C) the female (does it state they have standard genders?) eats the male, and the baby eats the mama.
HB... I have no clue, I think considering the fact that they go through their entire life with those blades, they'd be able to easily have sex without killing one another. And I'm pretty sure they're egg layers, IMHO, otherwise it seems like there'd be some kind of "*documentary voice* And while the mother lay sleeping, drugged from her own bodies endorphins, the baby spends 27 hours tearing, cutting and ripping through the mother's skin from the inside out in order to escape his wombed-prison."
I mean, born with blades? Ouch....
Andalites... Hung like horses does come to mind...
I think they'd have a retractable... Area. Or at least one that could be covered up or something. For two reasons, 1) too noble to have their wank hanging out while trying to shout commands and talk about how much better they are, I think they would have used clothing had that been the case, 2) You KNOW Marco would have made some kind of joke had Ax's willy been just flopping around the whole time.
Yeerks... *shuddergag*
Leerans... This has potential for planet-wide orgy. I mean, when everyone can read everyone's thoughts... Lol.