In the long term, no one can keep up a false nature about themselves, and a relationship based on that false nature is likely to fail once the truth comes out and the girl or guy realizes they're dating a total moron whose actions and mannerisms are completely opposite of what they liked to begin with. So the most effective way to go about it would be to just be yourself from the beginning. It seems cliche', but it's common sense. People can't just will themselves to change into something they think a person wants and hope to maintain it. Nor would it be very enjoyable if they could.
On the other hand, if you're just looking for a piece of ass, it's a completely different story.
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