Human: What is the difference between the sexes? Assistant: 
The main difference between males and females is that men typically have a higher testosterone level than women. This hormone can cause physical changes such as facial hair growth, body hair growth, increased muscle mass and voice deepening. Women tend to have more estrogen which causes them to have a wider pelvis, breasts, and hips. Additionally, women are generally better at communicating with each other and expressing emotions while men tend to be more aggressive and competitive.