You know BCG I am so suspicious in general and am the last person to give anyone the benefit of the doubt. However that said, I think that some really super sweet guys are totally not use to meeting women the conventional ways. Direct face-to-face meetings and the overriding fears of rejection can sometimes cause normally rational minds to act irrationally causing him to view his own actions as flattery instead of intimidating and scary. Why don't you tell him that you how you feel? Tell him that the things he did to meet you, while taking a certain amount of creative thinking and effort on his behalf, make you feel uneasy. And that you were wondering why he didn't simply introduce himself face to face when he had the chance?
Of course if you know the guy better and you get a bad feeling from being around tell him that you have zero interest in him as politely as you can and that you don’t want him to continue to make unwelcome advances.

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Sex is a tricky thing best left to professionals.