One of the strongest, most engaging concepts I've ever read in a sci-fi book! All of the concepts were explored in exactly the way I wanted them to be. Knocking off a few stars because of the very, very overt and uncomfortable sexism throughout the book. I understand it's because it's a Product Of Its Time, but yiiiiikes. Almost every female character is motivated exclusively by sex and seduction, and of course there's the woman who mentally regresses to being a baby and then develops a romantic and sexual relationship with her surrogate father as she "grows up"...YIIIIKES!