I'd agree with Virginia and Silly Old Bear--the study does NOT reflect the stories of my network of women friends, and appears sensationalized and skewed.
The fact that someone latches onto the survey seems to say more about that individual than about the actual sex lives of women. If the survey can be used to confirm someone's view that the majority of women are as sexually shut down as his own wife, then it reinforces his fears that his gains will not outweigh his losses with a new partner.
I recently read, in Prevention Magazine's summary of 400 readers' most distressing questions, that "low libido is the most common sexual complaint among women," with over 40% being affected. However, the experts responded that, apart from physical issues, the primary cause for this was in fact boredom with sexual routines. Which really comes back to the old chestnut that you're not going to have a satisfying sex life until you learn to communicate openly with your spouse.
Are the women who would prefer dental surgery to routine sex actually telling their partners that, or are they keeping silent to protect their partners' feelings, and only talking to the researchers?