Finger in the anus during sex?

Is this normal or is this an attempt to violate my anal region? The girl im seeing says that I will enjoy it but I think this is proper dodgy. I dont want finger in my arse hole. Should I finish her for suggesting such filthy and ludicrous sexual acts or should i let her do it once? Anyone here been finger in the arse hole and enjoyed it? Would really make me feel at ease if others have experienced it. She's a 9/10 too so I want to impress her.

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