The art of peacocking: Men behave better in front of women (and the hotter the woman, the more good deeds they will do)
Men use good deeds as a way to attract women, new research shows
They do more, and larger, good deeds when a woman is watching them
The more attractive they rate the woman, the more they try and impress
Women\’s good deeds are not affected whichever sex is observing
Men compete with each other to \’outdo\’ each others good deeds
You can pretty much build the entire gender difference in behaviour out of those few observations.