The muscle man and the nude young woman are based on P3 geometry, sort of. I assume they are like the other non-standard characters. For instance, the African American woman will take P3 body part morphs, but they blow up! Which means the vertices are the same in number, but in a different order. Zygote has had some consistency problems like this in the past, and with compatibility between models. These are minor details though, compared to the consistently great work they produce. Heck, every model I make doesn't come out perfect either (you should see my rather large died-and-gone-to-hell folder). Favorite Zygote model? Gotta be the P4 Posette, hands down. (The frog is pretty cool, too.) The Clothing CD is an excellent collection at a good price. =};-}>