While many things about sex seem to diminish with age, women's sex dreams actually seem to increase in frequency as they get older. In Dr. sample, only 2 percent of girls from adolescence to 15 had sex dreams- but among women in their forties (the peak period for sexual dreams), 22 to 38 percent of women reported having erotic dreams.

It's a little sad to note that men reach their peak frequency for sexual dreams in their late teens or twenties - 20 to 30 years before women reach their peak. The well-known sexual mismatch between men and women, whose responses and life cycles seem forever out of synch, is reflected even in sleep.