Pornucopia

Growing up, I was a Sci-Fi and Fantasy nerd, but rather than read Clarke or Tolkien, my favorite author was Piers Anthony. I read his Xanth series as well his Incarnations Of Immortality, Apprentice Adept, and Space Tyrant books, but I never knew his dirty little secret...

He also wrote a pair of adult minded erotic novels.

Pornucopia is about a guy who had a superhuman immunity to venereal diseases. The Amazon description sez:

Pornucopia is a picaresque black comedy that transgresses all bounds of everyday good taste. It begins in a near-future world where sex-vending machines and genital transplants are taken for granted.

Prior Gross, the hero and sex object of this wild adventure, thinks his fantasies have all come true when a beautiful young woman seduces him on a public beach. She turns out to be a succubus, beginning his initiation into a realm populated by demons that are not merely horned, but horny. He encounters a perverse cast of characters that includes a satyr, a vampire, and a pair of luscious sisters, one of whom tricks him out of his manhood.

Boing Boing, who brought the subject to light, found an authors note that is allegedly from the inside flap of the book:

...In 1969 Essex House was publishing some highly fantastic erotica, and I though I'd try my hand.

I started Pornucopia [as 3.97 Erect] that year--and quit a month later when the publisher shut down the line. My sexy market had been yanked out from under me just when I was getting hot! Later I recovered and completed the effort in 1970, my fourteenth novel. Now, after almost twenty years and considerable struggle, it is my seventy-fourth published book.

I try to do the best job I can do of whatever I do do. Here I was trying for something truly fascinating, outrageous, erotic and funny, as a challenge. I oppose censorship, and I feel the erotic urge should be considered healthy and fun, not obscene. I do have limits: you will find no sado-masochism. If there are any other erotic or scatologic taboos I have not gleefully parodied, I regret it; I plead a sheltered life.

However, in the interim I have developed a considerable juvenile readership, and I don't want my young readers to get in trouble. This novel is therefore being published and marketed for an exclusively adult audience, and may still shock and disgust many. Be warned: this is not Xanth. But those who want their minds wickedly stretched, read on.

I've outgrown the punny Xanth series, but it would be a laugh to see his style of writing with a porn twist. Or I could check out his other adult book, The Magic Fart (really).