The Stern and McClintock study involved applying collected sweat to women's noses to observe effects on their menstrual cycles.

“what they did actually was they took females, they charted their cycles, and then they had other females wear pads in their armpits and they collected sweat from those females, and then they took the sweat from those pads in those female's armpits, and they introduced them to women who had never had contact with the people who had sweated, they only had contact with their sweat, in fact, they swabbed it underneath their nose”