How are you planning on

collecting that? Also keep in mind that if there are bacteria present it is highly likely they will metabolize most

compounds in the smegma and you might need to keep it stored in a fridge to keep them from messing around with it.

Another possibilty, depending on the heat resistance of the pheromones in question, you could kill of the bacteria

by placing it for a prolonged time say 20-30minutes at like 65-70 degrees Celsius (should kill anything living in

or on the human boday unless you been skinny dipping around a deep ocean thermal vent or hot spring lately :P).