I don't know how statistics are created exactly but this is an alarming number considering we are suppose to be so much more sexually liberated.
And though the problem lies more with women there are men who are guilty as well.

NEW YORK, Dec. 16 (UPI) -- About 20 million U.S. marriages are believed to
be sexless, according to a new survey.

Among the 4,000 men polled by New York City sexologist and author Bob
Berkowitz and his writer wife, Susan Yager-Berkowitz, 68 percent of men
blame their wives for failing to ignite their passions.

Husbands, among other things, complained "she doesn't seem to enjoy it," the
New York Post reported Sunday.

"I'm game for almost anything," one 30-year-old man responded to the online
survey, "but her idea of adventurous sex is leaving the light on."

In follow-up interviews, men complained their wives would neither perform
certain sex acts nor show enthusiasm in the bedroom.

"For some guys it may mean that she's not doing what they see online, which
is unrealistic," Berkowitz said.

About half of the males surveyed said they were interested in sex, but with
people other than their wife, the newspaper reported.

"If these guys are not having sex with their wives, they're probably having
affairs," Berkowitz said.

© 2007 United Press International
Dec. 16, 2007