Male aggression is commonly pinned on testosterone, and estrogen is credited with imparting females with maternal instinct – but the true story of the sex hormones, and their roles in male and female behavior, is a lot more subtle. Here’s why estrogen is an important hormone for males and females alike.
…Using model organisms, biologists have learned some surprising things about the relationship between testosterone, estrogen, and sexually dimorphic behaviors, and wholly debunked the facile notion that testosterone drives male behavior, while estrogen drives female behavior.
Baldness is not a sign of virility, aggression or libido. All it means is that the hair follicles in the scalp are more sensitive to testosterone. It says nothing about overall testosterone levels or how that hormone is being used elsewhere in the body.