Is the male behaviour less altruistic than the female one?

There are many papers using dictator game framework, but only few of them focus on exploring the differences between women's and men's behaviour in this game. The hypothesis we test is that men are more selfish than women. To do that we conducted two versions of the dictator game experiment. In the first treatment subjects were asked to divide money between themselves and well known humanitarian organization after presentation by a organization representative. In the second modification a different group of subjects divided between themselves evaluation points of a particular university course in two rounds and in between these rounds a histogram of the aggregate results of the first round was disclosed to all participants. Experimental results indicate that men behave less altruistic than women in some situations. Men redistributed by 22.7 % less money to the account of the humanitarian organization than women. On the other hand, there was no difference in behavior between two sexes in the first round of the second treatment. In the second round, however, the behaviour of the two genders was significantly differentiated as women were giving by 14, % more points for the benefit of "opponent", as a result of information provided in the first round about aggregate behaviour of the subjects