I do consider rimming a normal part of sex and I'd be surprised if a guy who was eating me out neglected my cute little bottom
I've only ever ended up in bed with one guy who didn't consider it a normal part of oral, and I did say to him 'stick your tongue in my arse,' he seemed a little surprised by my order errr request
but was happy to oblige, he said after he'd never been asked that before. I don't consider it kinky or taboo, however, all of us have a lifetime of being told it's dirty to get over and some people find that easier than others. Some people will say 'I'm not licking someone's bum, it's dirty,' I always reply 'why are you with someone whose personal hygiene you think is bad?' I wouldn't neglect a man's arsehole any more than I'd neglect any part of his body, and I hope any man I'm with would feel the same about my body, that all parts are worthy of attention.
If you're a guy and whatever is happening with your arse is being done by a woman it's de facto an heterosexual act, I don't know why some people believe a love of anal play in a man indicates he's bi or gay, all men have prostates, all men have anuses, liking them being played with indicates you like anal play, it doesn't indicate your sexuality.