Is that your theory?
I agree with testosterone causing growth in unwanted areas but.
I'm a guy. I shave. I know that when you shave(particularly electric shavers) it stimulates the har folicle. Initially it grows back thicker.... When I shave it the next day its tough and I have to get many passes to get it all but.... If I wait over the weekend that Monday shaving is much better and the skin feels smooth well not like when I was young though.
I tried sugaring and plucking in other areas and the main problem is hair might start growing under the skin. My mom plucks at her facial hair daily. I bet most women do that too. Iv'e never heard of hair groing back thicker from plucking. There's not going to be any more testosterone available to the folicle than what isn't already available to the folicle already.
I once knew this one lady(hippy type girl) that refused to shave. She beleived that it was the natural thing to do. I think it looks cheesy. Who would want to kiss a mustachieod girl.