I have no facts, just personal
speculation/opinion.
I would think shampoo and/or conditioner may effect pheromones *if applied to the hair*,
not elsewhere on the body. Clean hair may make a difference in diffusion if nothing else (although the scalp sweat
gland emissions may do something - ???).
Applying to a bald head is just applying to one of the warmest parts of
the body, thereby affecting diffusion rates. It's said the top of the head is one of the two paces we lose/give off
most body heat (the feet are supposed to be the other).
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