The difference in sexual hair patterns between males and females is primarily caused by what?

The primary factor influencing the difference in sexual hair patterns between males and females is androgens. These hormones, which include testosterone, play a crucial role in the development of secondary sexual characteristics, including hair growth patterns. In males, higher androgen levels lead to increased hair growth in areas such as the chest, back, and facial regions, creating a more pronounced male hair pattern. Conversely, females typically have lower levels of androgens, resulting in different hair distribution that is often finer and less dense.

While genetics indeed influence individual hair patterns and may predispose someone to certain traits, it is the androgens that primarily dictate the intensity and location of hair growth based on sex. Estrogen levels do influence certain aspects of hair growth as well, but they are not the dominant hormone responsible for the sexual hair pattern differences. Aging can also affect hair growth, leading to changes in hair density and distribution, but these changes are secondary to the hormonal influences of androgens.