The answers may surprise you...
Adam & Eve is releasing more of the statistics from its Great American Sex Survey this week, and the results are... well, not all that sexy.
The 40 year-old sex toy company and adult industry leader surveyed 1,000 American adults to inquire about intimate acts and has been dribbling out the results bit by bit. Today's leaked stat: In response to the question "How often are you having sex?" 33 percent of respondents report having sex once or twice a week, and 22 percent report only having sex one to three times a month. The next highest group (19 percent) report having sex three to four times a week – that's more like it – but another 17 percent answered "seldom" or "never."
http://www.examiner.com/x-1916-Sex--Relationships-Examiner~y2010m2d5-How-often-are-you-having-sex-Results-from-the-Great-American-Sex-Survey-deemed-disappointing
And keep in mind that those are the stats from people who are actually willing to answer questions about their sex lives.