Yep I'm sorry to say this but, usually when a women approaches and tries to seduce a guy she comes across as easy. Although don't let that fool you, that doesn't mean he won't change his mind later- i'm talking in general here of course, about the first impression and the changing of mind

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I don't know what it is, I think men just like to dominate the situation, for instance if you throw a neg to a man, usually I think most men will actually get offended, especially if that leads to his mates laughing at him. Whoever said a mans weakness is his pride?
So I'd say give out non- sexual compliment? Not "Your hot!"(quite sexual, he'll think your easy), or "Gosh Your hansom, shame about the shirt. . ."(a neg), try this instead "Your a really interesting guy" or "I'm really enjoying this conversation", use the "Would you hurry up and ask me on date!" attitude. So he's still seducing you, but your the one leading. I think that would defiantely work on me.
Or in hindsight you could even, instead actually approaching him, lure him over with a 'come hither' hand gesture? Then just say "seduce me!"