I don't like the idea of not having a period solely because I know myself and know that I would probably freak out and take a pregnancy test every month. It has nothing to do with being natural or unnatural. Just avoiding unnecessary anxiety for myself.

Birth control has been around since the 1800's. Not to mention, women who never used birth control were more likely to die in childbirth. So while the sex itself was not considered "unsafe," there were still "unsafe" consequences. This is one of the reasons women starting pushing for birth control and sexual control in relationships.

But I still agree that to each his (her) own holds true.