It means a rising number of females worldwide are exposed to pre-natal testosterone from their male twin. Women are conceiving later in life as they put off starting a family for their career - leading to increasing reliance on IVF (in-vitro fertilisation). ![]() The number of twins being born has nearly doubled in many countries since 1980. The implications for society are especially important, say scientists. ![]() Double trouble! Nine celebs who you might not have realised were twins
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