"Women are the ones who put the brakes on sex."
Not always, low sex drive in males is suprisingly common.
According to Barry and Emily McCarthy, "inhibited desire is the most common sexual dysfunction, effecting one in three couples. Desire problems drain intimacy and good feelings from the relationship. One in five married couples has a non-sexual marriage (being sexual less than ten times a year). Three in ten non-married-couples who have been together longer than two years have a non-sexual relationship."
"Men are so ashamed of speaking up about low sexual desire," observes Michele Weiner-Davis, a marriage therapist from the Chicago area. It violates their own sense of masculinity. But "low desire in men is America's best-kept secret," she says, and estimates that it affects "at least 20 to 25%" of adult males.
For women, the figure is thought to be much higher, somewhere between 40 and 50%. A woman ducking out of sex, the headache thing, "is as American as apple pie," says Weiner-Davis. It's a staple of every comedian's routine.