I think fireelemental79 has a few URLs above her story (the one linked to here). She hasn't linked them, per se, but they are easily cut-and-paste-able. Also, here are some sites having to do with anatomy and sex in general (though I'm sure you are well aware of THOSE things. ^_~). Maybe they will have something. WARNING: the above section of that link has spoilers to Emma's Surrender the Grey, so if you aren't caught up to ch. 6 yet, you may want to rush on by to the links at the bottom. ^_^