As far as history is concerned, there has never been a time where all men had rights, or were "entitled to sex" simply by virtue of being a man. I'd argue that even in ancient 'patriarchial' cultures, birth would have had a role in a man's rights, much as it would have in a woman's - a man born into royalty or aristocracy would have tended to have more rights than ordinary men, much as a queen or princess, such as Cleopatra or Victoria would have had more than an ordinary woman. This is why, on some level, the modern notion of "men's rights" is rather silly, especially if it appeals to some ancient "machismo" - if one reads ancient texts such as the Bible, for example - some men had the misfortune of being turned into eunuch's and forced to work in the king's haram. An ancient king or ruler never would have allowed one of the "incels" we see crawling out of the woodwork anywhere near his queen or princess, and that likely would have been followed by a gruesome death, much as how rape, according to ancient texts, often resulted in a male relative such as a brother or father engaging in a blood feud. If anything, the only reason an "incel" has the luxury of thinking himself entitled is because he lives in a culture which protects his rights to be a fool and a waste of oxygen, rather than just eliminating him as an ancient culture likely would have. This is why I laugh at such absurdity.