Narcissism combined with high testosterone makes men more generous.

The experiment involved 151 men from Poland. They took psychological tests to assess narcissistic personality traits, passed testosterone levels and participated in an economic game that determined their ability to share with others. The most generous were men who were not in love with themselves and had a normal level of the hormone. However, testosterone-boosted daffodils were just as generous. The most greedy were men with narcissistic traits and low testosterone levels, as well as men without a narcissistic complex with high levels of the hormone.