http://chemse.oxfordjournals.org/cgi/con...t/bjq030v1
"...first example of a gender-specific phenotypic difference in olfactory sensitivity in favor of males."

"...our finding of a monomodal distribution of sensitivity for bourgeonal is not trivial given that several odorants, including some for which a female superiority in detection thresholds have been reported, such as the putative human pheromones 4,16-androstadien-3-one (Lundstro¨m et al. 2003) and 5-a-androst-16-en-3-one (Labows and Wysocki 1984), exaltolide and musk ambrette (2-tert-butyl-4,6-dinitro-5-methylanisole, Kalmus and Seedburgh 1975), as well as acetone (Odeigah 1994) and methanethiol (Lison et al. 1980) were found to display bimodal distributions of sensitivity.

James V. Kohl
http://www.pheromones.com