In a surprising contradiction of long-held beliefs, a new study by researchers at VU University in Amsterdam suggests that men are just as cooperative as women. In fact, according to a report on the research in HealthDay, men actually cooperate better with other men than women cooperate with other women, yo. HealthDay reports that the researchers, who analyzed 272 studies conducted over five decades and comprising almost 32,000 people in 18 countries, found that men are equally cooperative as women, particularly in social dilemmas in which the interests of one person conflict with the interests of a group. How could that be? In a news release, head researcher Daniel Balliet suggests that “Ancestral women usually migrated between groups and they would have been interacting mostly with women who tended not to be relatives, and many were co-wives, so social dynamics among women would have been rife with sexual competition.” In other words: it’s a woman problem.