I think PABBIS (Parents Against Bad Books IN School) is a little too interested in in "bad" books. The following is an excerpt from its "SAMPLE BOOK REVIEW DOCUMENTATION FORM."
For each type checked above also indicate level of vividness/graphicness using the following as a general guide:
Basic (B): large breasts
Graphic (G): large, voluptuous bouncing breasts
Very graphic (VG): large, voluptuous bouncing breasts with hard nipples
Extremely graphic (EG): large, voluptuous bouncing breasts with hard nipples covered with
glistening sweat and bite marks
Link (thanks, sugarhole!)