We are all born with both masculine and feminine behavior. Check your finger length. Finger length is the only physical trait at birth that’s different in males and females, besides genetalia. While still in the womb, the growth of our finger digits is affected by the sex hormones testosterone and estrogen. These hormones also have an effect on our brains.
Males tend to have a ring finger that is longer than their index finger (average: 1 to 0.96 ratio), while females typically have index and ring fingers of the same length. According to John Manning, a biologist who first identified the significance of ‘finger digit ratios’, “females with masculine digit ratios have more masculine behaviors and males with a typically female ratio exhibit more typically feminine behaviors.” Girls with the male-type finger lengths tend to be more hyperactive. Lesbians are more likely to have this finger ratio.