The Ash Twins Blog

http://www.nytimes.com/2008/10/28/health/28well.html?8dpc

Two excerpts:

Theories vary about why more people appear to be cheating. Among older people, a host of newer drugs and treatments are making it easier to be sexual, and in some cases unfaithful — Viagra and other remedies for erectile dysfunction, estrogen and testosterone supplements to maintain women’s sex drive and vaginal health, even advances like better hip replacements.

“They’ve got the physical health to express their sexuality into old age,” said Helen E. Fisher, research professor of anthropology at Rutgers and the author of several books on the biological and evolutionary basis of love and sex…

The General Social Survey data also show some encouraging trends, said John P. Robinson, professor of sociology and director of the Americans’ Use of Time project at the University of Maryland. One notable shift is that couples appear to be spending slightly more time together. And married men and women also appear to have the most active sex lives, reporting sex with their spouse 58 times a year, a little more than once a week.

“We’ve looked at that as good news,” Dr. Robinson said.