CFNM = Clothed Female, Naked Male. It's a form of porn.
It's primarily sold to homosexual men.
The sad reality is that a lot of bodybuilders do things like stripping, gay porn etc to help pay their bills. This isn't a cheap sport by any means and you can make a lot of money doing it.
It's not something I would do personally. Once you get the reputation of being a stripper, you will never loose it. It'll be stuck with you for the rest of your life.