I don't think that's the question he's asking.
It is my understanding and experience that it will not be obvious. I think there is a common perception that having anal sex will stretch you out and that anyone, with sufficient knowledge, will know, just from looking, that you have had anal sex. From my personal experience this is not true.
Now I'm sure it you manage to get a fire plug up you ass the world will probably find out. But generally anal sex becomes easier, not because you stretch out but because you relax.
So relax.
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