Her point may be that for some women they need the pill to regulate their period or they suffer pain and other complications with their cycles - like some women bleed to much, etc.  You would know this if you were discussing an issue regarding a body you had yourself and body parts that were on your flesh but you are not so you have become just another silly man talking from his ignorance.   Maybe you should discuss the subject with people who have female parts before you judge what they need for their health. 

I don't demand you provide a reason for a prostate exam.  I make the assumption it is appropriate that whatever you need for your healthy prostate is best decided between you and your dr.  Please make the same assumption about women.