Women who are ovulating find other women less attractive, says Canadian research. But not everyone is convinced this means women put down other women's attractiveness as part of a competition for men. Psychologist Dr Maryanne Fisher of York University in Toronto reported her research in the Royal Society's journal Biology Letters. Fisher investigated an evolutionary-based theory that hormones influence competition between women for potential mates. She looked at the relationship between women's oestrogen levels and how attractive they thought other women's faces were. The study assumed one potential strategy of women competing for males was to make rivals appear inferior,...