Its a weird social media thing about sexuality, given the 'gross' quality of the ass (though technically, you can't get as many sexual diseases from an ass as you can genitalia, can you?)
Interestingly enough, this culminated in one of my favorite stupid music moments of 2015 because Rapper Kevin Gates openly admits his perversions in social media and interviews, so there's a great vid of him ranting about his ordeal of the constant reactions to it (even better in this clip of current internet comedy personas Desus & Mero reacting to it). This all happened last year mind you.
But its become such a talking point more or less in the POC side of the community (The #Americana culture probably hasn't even thought of this) that Jhene Aiko purposefully alluded to expectations of getting her rear eaten on a track (complete with the over-hyped "I'll make him do it!" gleeful adlib) that has become a decently moving national hit. Kind of a radical difference from her usual "I'm a ethereal stoned babby" routine.
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I guess that's as much as I have to say on the matter, as I don't need a bunch of dudes with extensive opinions on Omni Trio remixes knowing about my sexual opinions. No offense guys.