Discuss the current research relating the 2D:4D ratio and presence of otoacoustic emissions to sexual orientation.
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Male 2D:4D ratios, particularly in the right hand, are typically smaller than female 2D:4D ratios, although the distributions of the ratios show wide areas of overlap. This means that the female index and ring fingers are similar in length (ratio approaching 1.0), while male index fingers tend to be shorter than ring fingers (ratio of about .955). Lesbians tended to show the more masculine pattern of finger length, suggesting that they might have experienced prenatal exposure to androgens.Females produce louder and more frequent otoacoustic emissions. These differences appear early in life and are possibly due to the amount of prenatal testosterone exposure experienced by an individual. The rate of the emissions in lesbian and bisexual women fell between the typical levels for heterosexual women and for men. It has been suggested that exposure to prenatal androgens may have influenced both the ear structure and sexual orientation of the lesbian and bisexual women.
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