In my previous post on sperm competition I wondered about the use of the term "promiscuous" to describe females and GC responded that males are (generally, and with caveats) by definition promiscuous (at least by aspiration). Since I believe it nice to put numbers on such things, here is what I found in the 1994 book Sex in America, based on the University of Chicago sponsored survey in the context of the number of sexual partners since age 18:

The survey also gives 2 and 6 as the median numbers of sexual partners for females and males respectively. Even assuming for underreporting (females) and embellishment (males) there is a nontrivial difference in the distributions. It would be best if we could look at 60 year olds, but I couldn't find that particular table via Amazon's search feature.