"Those who look for flings date more. Most men who date are looking for flings."

Most dates don't turn into anything serious, but I doubt most men who bother to date are looking for a "fling", your definition of "date" may just be overbroad.

Hence asking about per-capita, not per date, numbers. :).

Well, most men are looking for flings (biologically). Some women are looking for flings. Whether or not most people are looking for flings depends on whether (A + B) / dating_population is > 0.5. I would suspect it is, but statistics to the contrary would be an interesting discovery.