Sex By the Numbers

, Move over Masters and Johnson. Samuel and Cynthia Janus, another husband-and- wife research team, surveyed 2,765 men and women across the U.S. about sex.

--44% of men and 41% of women said their sex activity is up from three years ago; 27% of men and 32% of women said it has decreased.

--59% of married men and 61% of married women said sex is better after marriage.

--35% of married men and 26% of married women reported having had at least one affair.

--10% of men and 4% of women reported they have had sex with more than 100 partners.

--31% of those who consider themselves "very religious" have had an affair; 71% have had premarital sex.

--26% of women who consider themselves politically "ultraconservative" have had an abortion.

--22% of men and 17% of women reported having had at least one homosexual experience.

--45% of women and 19% of men said they have been sexually harassed at work.

--20% of men reported selling or buying sex for money at least once, compared with less than 8% of women.

--47% of men and 23% of women masturbate on a daily or weekly basis.

From the new book Janus Report on Sexual Behavior (Wiley, $24.95).