I have a problem with following point from
http://pharyngula.livejournal.com/5412155.html :
"In over 30 years of teaching, this was the only time a woman attempted to extort me. Once. In 30 years. At the same time, every year I have heard of rapes and/or attempted rapes on my campuses. Final point stands confirmed."
actually there are more than one:
1. Anecdotal evidence
2. Selection bias