The researchers found that while straight men are only aroused by females of the human variety, straight women are equally aroused by all human sexual activity, including lesbian, heterosexual and homosexual male sex, and at least somewhat aroused by nonhuman sex.

• monkeys
• psychology
• science
• sex

Keith Chen is doing economic research with monkeys; teaching them how money works. "When taught to use money, a group of capuchin monkeys responded quite rationally to simple incentives; responded irrationally to risky gambles; failed to save; stole when they could; used money for food and, on occasion, sex."

• economics
• Freakonomics
• money
• monkeys
• Stephen Dubner
• Steven Levitt