A weekly look at sex and culture, by the numbers.
40%: Decrease in fertility rates from mice kept on a normal sleep/wake schedule and those whose sleep patterns were disrupted in a recent Northwestern study
4700: Age of a Chalcolithic man found buried in the dress and manner of a woman in a Bronze Age settlement near Prague
90: Minutes a night the average penis becomes erect during sleep
13: Anniversary of “Courage,” a Catholic sports camp for celibate gay men in Philadelphia
15 years: Maximum sentence faced by a 43-year-old New York superintendent accused of having sex with a tenant’s Labrador