There's also some other stuff that is not in the physics book but is in the later books about dating, boy girl relationships, and kissing, etc. And it's not so much in a healthy sort of way IMO. Stuff about the girl fantasizing about the wedding while the boy is writing a geometry proof. I don't know if you'd call it sexist.
In Peanuts, Lucy is forever distracting and (unsuccessfully) wooing Schroeder while he is practicing the piano. She's even worse to Charlie Brown and is generally awful. I'm not going to stop my children, including my daughter, from reading Peanuts. I doubt that they are strongly influenced in the long term by the fictional characters they come across.
