I do hope someone picks up Liulfr, even for just a small expansion to flesh them out a little more.I think the question was more about en-vagining characters rather than de-dickening. But the answer is probably just that it isn't as popular among the writers.
Generally if female characters will come with a pussy if it's intended for them to have one, and if they don't then there's probably a reason the author doesn't want them to have it. There's design space for boypussy, but I think there's only three options for that currently. It just doesn't seem popular. Liulfr comes with one and you can give one to Berwyn and male Lyric. And Liulfr is unfinished and his author hasn't been seen in years.
