Therefore homosexuals appear to be more androgenised (lower 2D:4D) than heterosexuals in some populations, while in others they appear to be less androgenised (higher 2D:4D) than heterosexuals. However, mean 2D:4D ratio is relatively constant among male homosexuals from different populations, with a mean of 0.96 to 0.97. The digit ratio (2D:4D) is said to be a potential marker of exposure to prenatal sex steroids. Normative values of male mean 2D:4D ratio vary between 0.94 to 1.00 across populations. Background: Connections have been made between the relative lengths of the index and ring fingers, known as the 2D:4D ratio, to prenatal testosterone. We review the available literature, and provide further data on 2D:4D in male heterosexuals and homosexuals.
Data on 2D:4D and testosterone from two samples were collected: (1) 43 men attending an infertility clinic, and (2) 51 men drawn from the general population without regard to fertility. Background: Digit ratio (2D:4D) is a putative marker for prenatal testosterone and is correlated with performance in many sports. There is evidence that the relative length of the 2nd and 4th digit (2D:4D) is negatively correlated with prenatal testosterone. 1 15273869 Aim: To investigate the relationship between 2D:4D and testosterone in men attending an infertility clinic and men drawn from the general population. Recent evidence suggests that the relative length of the 2nd to 4th finger (2D : 4D ratio) is a pointer to prenatal testosterone levels and may thus serve as a. The question of the prenatal androgen status of male homosexuals is therefore of importance. Male homosexuals are said to have experienced high prenatal testosterone, and testosterone may have deleterious effects on the immune system.
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