To the extent of making most polls invalid?here's a reference:
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Fake lie-detector reveals women's sex lies
Women are more likely than men to lie about their sex lives, reveals a new study. Women's coyness about their sexual behaviour was unveiled by a US study involving a fake lie detector test. In surveys since the 1960s, men typically report having more sexual partners and than do women – a...www.newscientist.com
Women lie in surveys.