But industry alone does not explain the wage gap. Among students entering finance, men are still nearly four times as likely to earn more than $110,000 per year, and three times as likely to earn $90,000 to $110,000. Admittedly, the sample sizes are small. But the same holds true in consulting. And in technology and engineering, 79 percent of men expect to make more than $90,000, compared to just 44 percent of women in the same field.

SEX, DRUGS, AND PRIMAL SCREAM

Some differences between men and women might be simpler to explain than the complex factors behind these differences in pay. Take porn.

Men like it so much that 52 percent of them watch it online at least once a week. 14 percent of male students have never watched porn at all. But among women, just 6 percent watch porn as frequently as the majority of the men, and 63 percent have never watched any.

On drinking and drugs:

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Where We Stand: The Class of 2013 Senior Survey

• Nearly a quarter of the class said they drink more than twice a week.

• 9 percent never drink, and 7 percent drink less than once a month.

• Among students who drink, 60 percent started before they came to Harvard (though 10 percent waited until they graduated from high school).

• At Harvard, most started right away, but 9 percent waited until they turned 21.

• 38 percent of students have tried marijuana, and 3 percent use it more than twice a week. Of marijuana users, 44 percent started at Harvard; the rest started before college.

• Almost a quarter of the class uses tobacco at least occasionally, with about 40 percent of users having started at college.

• 16 percent of the class has tried at least one of cocaine, ecstasy, mushrooms, LSD, and other illicit substances. Very large majorities of those who have used these drugs first tried them after starting college.

• 9 percent of the class has used drugs like Adderall and Ritalin, which are prescribed for attention deficit disorders but often abused by students who hope the pills will help them focus on their studies.

The survey also questioned students about their sex lives, finding that 72 percent enroll at Harvard as virgins and 27 percent graduate without having sex. Of those who do have sex at Harvard, most have just one partner during their four years, but 7 percent of students have 10 or more sexual partners in college.

The daring do it in the library—13 percent of the class, it turns out. Sex in Widener is the least commonly achieved of the “big three” tasks known to Harvard students: 23 percent have urinated on John Harvard’s shiny foot, and 32 percent have run Primal Scream. Just a few hardy folks—4 percent of the class—accomplished all three.