Well, now you intrigue me. In your stories, what were the beings with different forms of genitalia like? What were the stories like (esp. the non-juvenile ones)? Have such beings ever appeared in your games?
One of my stories was called "The Embrace." It centered around a race who had a series of genitalia from the center of the chest to the crotch. They would "embrace" to breed and the level of contact that was allowed between the partners (who both had penetrating and receiving apparatus) determined how "intimate" the connection. A superficial pair of lovers may only have allowed a few minor penetrations and receptions while lifelong lovers would use every connection possible.
Another race that I developed were male, female and trimale (who hasn't done something like this?)
. The male and female could breed, but not produce offspring without the addition of the trimale. A Trimale could carry the seed from a male for a long period of time before implanting it within a female. The society that developed was interesting in that the only truly "free" people were the trimales. Males and females had their highly organized and politicized and socially striated structures and the Trimales moved in and out of society.
Something I didn't write, but that I thought was quite well done, is the Centuari sexuality written by JMS from
Babylon 5 where the males have 9 penises and the females have 9 vaginas. The number of penetrations by the male (extremely long and tentacular) penises determines how perfunctory or intimate the encounter is. Political marriages may require a specific number of penetrations on a scheduled basis, but a mistress may allow complete penetration in a happy, cavorting style. I thought it was very well done.
My most favorite odd-genitalia race centered around the union between a male and female whose soul focus was upon their "progeny." The female's genitalia, when pressed into the mud of the swamps would create a shape that defined the icon for their race. An egg would be deposited in each depression and then the male would guard over the eggs until they were able to fend for themselves. I can't say much more at this time, but the shape of the female genitalia determined the course of their race and culture in quite a number of ways. It was the conflict over the control of
how the shape was used and who chose that use that defined their culture (it was a metaphor for men controlling the details of a mother and her off-spring).