Now that I have your attention
I was recently looking at a photo set on one of those quasi-artsy nude sites and there was a set of an exceptionally pretty (in the most girl-next-door sense) girl who was about 18 or 19. She had done several sets before and always kept to pretty demure posing but in this one set, she appeared to be "opening up" more. In one particular photo, she was shot from above on her hands in knees with her butt arched up, her cheeks were parted open and between them, clear as day, was her cute anus, visible to the viewer for the first time after months of photos that were significantly more modest.
This wouldn't mean much as some girls start showing off the bits from the get go but something about her slow, protracted tease and her innocent look set the comment section into a frenzy when that photo was published. Guys were commenting on how beautiful it was that she had finally surrendered to the viewer the "most intimate" part of her body (referring to her anus). The conversation quickly turned oddly philosophical, that there was something strangely humanizing about seeing such a beautiful girl's anus. It was like how you build a beauty up as the idealized, flawless goddess in your mind but then, when confronted with her most explicit orifice, you recognize she is ultimately human and her revealing that humanity is like a beautiful and erotic exchange of trust.
Now, this could all be written off as pretentious prattle but it seriously got me thinking. Why do many men view the anus as the "most intimate" part of a woman's body. It is not as singularly feminine as the vagina nor strictly associated with sexual reproduction like the vagina but it is often regarded as even "more private." Beyond a simple glandular attraction, what do you think the allure if of the female anus is? Do you relate in seeing a beautiful woman's anus as something that's transcendently erotic?