Name a situation in which the rules have been clearly violated? That is, what are things “nice girls” or "nice boys" just don't do?

A situation would be where "nice girls" or "nice boys" don't do collecting and selecting the best. This means that girls/boys shouldn't go on multiples dates to find the right guy/girl to go out with. They also shouldn't each on each other once their boyfriend/girlfriend.

http://reesie.net/wp-content/uploads/2010/02/CheatingGeneLS.jpg The man is cheating on his girlfriend.




The woman is cheating on her boyfriend.