How do oral contraceptives affect your sense of smell?

Use of an oral contraceptive might affect a woman's ability to sniff out a partner. In a study where women were asked to sniff men's sweaty shirts, those on the pill typically chose odors that were genetically similar to their own as being the most attractive. Human beings are inclined to go for genetically dissimilar mates. Obviously. this doesn't apply to those people who admitted having sex with their cousins.