Yep, Horse Organ by Davo...

Satanica Inc. has fits for the Sanctum Art Phenotypes and the Sixus Grey Alien (with corresponding textures) amongst others (many others).

Strideri has a rather formidable Poser Penor fig that fits just about any male or female character there is.

The Poser Penor mine of opportunity has been thoroughly delved I'm afraid... Not that penors are my particular Poser penchant, I just happen to have a fascination for tentacles and the absurd. Nipple bones fer instance, and yes, Renderosity has a V4 rigged with nipple bones. See Kawecki's store... (from product editorial)-

"A new Victoria 4.x or Aiko 4 character that has nipples as body parts. Now Vicky4 has rNipple and lNipple that you can move up-down side-side, twist and scales. Moving the nipples the respective breast will follow creating amazing breast dynamics in a very easy way and you can even use "point-at"!!!".