I have Nancy Friday's "My Secret Garden" and it's great stuff!
Yes, there's some stuff about , , under age sex etc, but I just avoid all the bits that turn my stomach.
I don't agree with censorship. These things exist - whether in fantasy or reality - so information should be made accessible. Brushing it under the carpet is potentially damaging to society as a whole. Information is education. Dangerous in the wrong hands, granted, but knowledge can be powerful in a positive sense also.
However, I do agree that books containing such material should carry some sort of warning on the cover.
