linguistic:voice_change
Prenatal environment

Supporting this are studies of the finger digit ratio of the right hand, a supposed marker of prenatal testosterone exposure (however subsequent research has been critical of using digit ratios as a marker). Lesbians on average were found to have significantly more masculine digit ratios, a finding which has been replicated numerous times in studies cross-culturally, but sometimes contradicted, such as when ethnicity is taken into account. While direct effects are hard to measure for ethical reasons, animal experiments where scientists manipulate exposure to sex hormones during gestation can also induce life long male-typical behavior and mounting in female animals, and female-typical behavior in male animals.