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My research into surveys shows that women continually express a preference for men with deeper, smoother voices because deep tones are directly linked to testosterone levels. The change in voice tone is noticeable in boys because, when they reach puberty, their bodies flood with male hormones as they begin to change into men and their voices 'crack' virtually overnight.

So this means when a man is around a woman he fancies he's likely to start speaking in deeper tones to highlight his masculinity while a responsive woman is likely to start talking in higher pitched tones to contrast her femaleness. Since the feminist movement began in the 1960s, women have taken on male job roles and tasks that require the production of testosterone, the hormone that drives us to achieve and that has been described as the 'success hormone'. Research now shows that in countries such as the USA, United Kingdom, Australia and New Zealand where feminism has been more influential, women's voices have become deeper because women have become more assertive and authoritative. Remember that testosterone is also responsible for hair growth.

Let's hope women in the future don't have hairy chests.