] It's difficult to say exactly how many of the 113
] million married Americans are too exhausted or too grumpy
] to get it on, but some psychologists estimate that 15 to
] 20 percent of couples have sex no more than 10 times a
] year, which is how the experts define sexless marriage.
] And even couples who don't meet that definition
] still feel like they're not having sex as often as
] they used to.

Now the question is, are the numbers reflective of a change in sexuality from how things were a hundred years ago? Or are we just getting better statistics to prove something that already existed?

Newsweek: Are Married Couples Having Less Sex?