Ha ha, well I hope people get nastier as they get older!
If you don't like rimming, don't do it. For me, it's always been hot as hell. I first had sex with a guy at 18 and, without talking about it, I just stuck my tounge in his dirty ass, 'cause he was hot as fuck and I thought it would be okay – and because PORN LIES! He apologized and said if he'd known I wanted to do that, he would've cleaned up, but I just shrugged it off and said it was cool (like a true assman should), and we laughed it off.
Now that that's in the past and I'm mumble years old, I hope I AM looking forward to nastier years!
The moral of the story is: wash your asses, boys!
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