@StarX Have you ever gone thru the Facebook policies/community standard guideline? Do you think Facebook should allow your sexy pages to be there for people to enjoy? Facebook is a social networking platform and not a porn site.... lol, you need to first understand that before blaming FB's algorithms.
Please refer -
https://www.facebook.com/communitystandards#nudity to understand that FB is not going to allow such pages to be there. And in the reference link provided they have clearly mentioned that post/links promoting nudity are removed by FB (whenever they identify it)
Th biggest mistake which we all intend to make is not understanding Facebook policies and working around it. If you work with in their policies there is no way FB is going to penalize any page admins with zero reach or unpublish any pages.
People can earn tons from their respective page audiences but all that needs to be achieved with out breaking any rules set forward by FB.
I have been earning $250 to $500 daily from my 1.3 Million page by just sharing affiliate content links from ViralAux (As they provide Facebook policy safe content links). I have not had any problem on my pages as I make sure that I don't spam or post any unwanted links.