Here is some reading fodder for you. This is why some of us can or cannot smell pheros.

\"The currently accepted theory of why one molecule smells like it does is based on a discovery made by British scientist John Amoore in the 1950s. He found that people\'s perception of smell was not always the same and some people had \"blind spots\" to certain smells - a condition called anosmia. Some people for instance cannot smell the male hormone androstenone others cannot sniff out musk or camphor. Amoore speculated that the receptors in the nose responsible for sending the signal from each aroma to the brain worked like a lock and key and for people with anosmia they had some locks missing.\"