To tell the truth, I would never do anything in a bathroom at work, which it would be against my personal interests for the company to know.
I would not presume, they are not doing so.
You do not own the bathroom at work either. That’s true.
I just don't think the size of my johnson is any of their business. It has gone too far. With many salary employees our personal lives are very intertwined with our work lives. I work from home all the time to assist my employer when needed... I think that justifies some amount of privacy while in the office as well.
If I'm working 70 hours in a week to meet some absurd deadline, I should be able to email my wife from a personal email account without having some nosy goon read it or harass me about it.