I just posted this in the men’s section (Naturally increasing your testosterone production - #11 by ariadne), and I wanted to repost it here for posterity. Also in case any women read this section more than the men’s and have anything to add. 
This is my assumption, too, based on my experiences over the past couple of months with my TG. He is very reactive to me when I am wearing copulins, and I have noticed that after being in close company together for at least several minutes, I start smelling him strongly. At first I didn’t know if this was just my reaction to his natural scent (that I was noticing it more since being around him is very arousing to me 
) or if it was his reaction to my copulins. I’ve experimented with wearing cops-free pheros and no pheros at all around him, and I do not notice a stronger smell in those times.
To illustrate how strong this smell is to me, I can pick it up about 5 or 6 feet outside of his office.
An aside to this is, this natural scent he puts off is extremely, extremely arousing (even when he’s not pumping out more due to my cops ). If I had a shirt of his that he’d worn all day, I’d probably carry it around with me all the time just so I could huff his smell. He doesn’t wear colognes or any other scented products, it’s just him. I wish more men would do this.