He has subsequently questioned the utility of the survey on the grounds that even for questions with 600 responses, for any given year of age there might only be 5 or 10 participants. The criticism is inane. Unless the issue at hand is how 53 year-olds feel about something, that doesn't matter. If it did, polling organizations that gauge things like President Obama's approval rating or the level of support for same-sex marriage would be out of business unless they could devise an economically viable way to 10,000 people for every poll they conducted. Instead, they conduct surveys with 3% margins of error in either direction using samples a tenth that size or smaller. If statistical reliability was desired not just for age in years, but age in months, the required sample size would grow by another order of magnitude.
But Whiskey's is the place for that to be addressed. The purpose here is to show that there is no massive shifting in female sexual behavior currently taking place in the US. The following graph shows the average number of male partners women aged 25-30 report having had since turning 18, beginning in 1989, the first year respondents were queried on it:
The trendline is pretty flat, perhaps rising marginally over the last couple of decades. The anomalously high mean in 2000 is the result of one woman reporting 122 partners. Removing her from the calculation yields a mean of 5.15, nearly identical to the 2002 result. For the last 15 years, young women of middling salacity have, with the exception of 2002, consistently reported having had three partners. The mode (most frequently occuring number of partners) in every year is 1. That is, if you ask a woman in her late-twenties how many people she's had sex with, the reply you are most likely to receive is that she's had just one.
The following table shows the percentage who say they have had ten more more partners as well as the total sample size for women aged 25-30 who were asked about their sexual behaviors:
The prevalence of 10+ women appears to have edged up a bit over the last couple of decades, with about one in seven having had partners in the double-digits by the time they reach the age of 30. Even sleeping with ten different people over ten years hardly qualifies as slutty behavior--it amounts to a different person each year. Not all women are made for long-term relationships, after all.