Why does a guy keep asking me questions that are sex related when as far as I know, we don’t know each other?

Is he curious about women in general and bored, which is fair enough, or is it likely that he’s someone I know wanting to know more about my personal life, when I don’t realise it?

Why does a guy keep asking me questions that are sex related when as far as I know, we don’t know each other?
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