How did you learn that anal sex existed, specifically?

I'm not talking about literal experience... i mean, how did you 'hear about' or 'read up' that anal sex even was 'a thing' or that it was possible. Especially if, like me somewhat, you'd never really ever considered anal sex and only had ever thought of sex as vaginal (and lesser, oral) only. Not a guy sticking his penis inside and deep up in his lady friend's rear-end. I only 'heard about' anal when i was 18 and only seriously looked it up in online research when i was 22/23.
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