"Sex in America, the Definitive Study" is perhaps more useful.[1] This was done in the 1990s. They selected about 3000 people in the US at random, using proper random selection techniques. Each person was both surveyed and interviewed. They tried hard to convince the selected people to participate, so as not to unbalance the survey. They went to a lot of trouble to get good results. The results are thus more meaningful than self-selected surveys and surveys of college students.

The results are unsurprising, but interesting. The New York Times has a summary.[2]

[1] https://www.amazon.com/Sex-America-Edward-Laumann/dp/0446671... [2] http://www.nytimes.com/1994/10/07/us/sex-in-america-faithful...