I understand that some women enjoy it.
Back in my day, before online porn, most men saw the occasional soft porn mag a la playboy, and probably a video or two that again, were mostly soft porn. In consequence, anal wasn't really on their radar in the same way. I never had a guy even mention it in all the boyfriends I had before DH.
None of my women friends back then were pressuring their men into giving it a try. We all enjoyed sex.
So to me this idea that anal is pretty mainstream and something most women try, is a very new idea. Trust me, it wasn't always like that. Of course some women enjoy it but for women it is not without risk. Female anal sphincters and canals are less robust than men's. We have no prostate to stimulate via anal sex.
To my mind, before men watched easily available hard core porn from a very early age, there was much less pressure on women to engage in what is quite a risky sex act. And my observation that it was very uncommon when men didn't pressurise women, leads me to believe that it's not women begging for it that had led to its inclusion in mainstream sexual practices. It might not even always be men, it's more that people know of it and there might be a desire to explore and seem edgy and cool and not "vanilla". There's a fine line between enabling some people not to be shamed for their kinks, and causing many more to be shamed for not enjoying or wanting to explore those kinks.