http://www.slate.com/articles/health_and_science/human_nature/2010/10/the_ass_man_cometh.html


4. Homosexuality. Apparently, a lot of people try gay sex, but only about half stick with it. By ages 18-19, 10 percent of men say they've performed fellatio. That number drops among men in their 20s and 30s. But among men in their 40s and 50s, 13 percent say they've done it, and 14 percent to 15 percent say they've received it from another man. Meanwhile, 11 percent of men aged 20-24 say they've received anal sex. For unknown reasons, that number declines in the next higher age bracket but then steadily rises in succeeding brackets, leveling off at 9 percent among men in their 40s and 50s.

Remember, these are "have you ever" questions. When men aged 20-59 are asked whether they've performed fellatio in the past year, the number is more like 6 percent. And only 4 percent say they've received anal sex in that time. But that's a big jump from 1992, when only 2 percent of men admitted to sex with a man in the preceding year.