There is no such a thing as taking masculinity away from male dogs with bows...if it had, what about neutering? It is a personal choice...my Mojo always has a topnot, maybe even litte cute blue or black bows...and he is not less of a male because of that. When i have a female she will also use bows, i wanna keep them with a full coat and i think it would look kind of stupid having everything but the hair on the head long...and if you ask me the mullet haircut does not look good on Mojo (been there, done that)
But that is just me, it doesn;t make the dogs less of a male or less than a yorkie to have bows. That is a human preference and it is up to us to choose.