Lastly, no studies investigated so far the potential role of testosterone in the association between sexual orientation and speech acoustic features. Moreover, most studies have been conducted with English-speaking populations, which calls for further cross-linguistic examinations. Regarding acoustic features of speech, researchers have hypothesized a feminization of such characteristics in homosexual men, but previous investigations have so far produced mixed results. Potential differences between homosexual and heterosexual men have been studied on a diverse set of social and biological traits.
