How to Write About Hermaphrodite Sex

You've got two life forms who are hermaphrodites, and they're having sex. But how do you describe it accurately, without calling on human-centric terms like "male" and "female" or "penis" and "vagina"? It's one of those rare writing questions that comes up for both scientists and science fiction writers. In the interests of… » 8/31/12 4:50pm 8/31/12 4:50pm