I made a thread that talked about this not too long ago. It’s in the phero theory forum (The Science Behind the Mayhem) if you want to check it out. I believe the pheros are in fact absorbed by the skin and do enter the blood stream and act to create modest increases in testosterone levels. They are however (for the most part) hormones that are naturally found in the body (i.e Androstenidione is the direct precursor to Testosterone). So while they may increase hormone levels, they should not be detected as exogenous steroids unless you literally bathe in them (in which case you have some issues to work through 
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