How to seduce a woman
wine her
dine her
buy her flowers
compliment her dress, hair, and shoes
write poetry for her
sing love songs for her

How to seduce a man
show up naked
bring beer

ericthered just about nailed it. All I can think to add would be possibly wear something a little more daring than you normally would. If you have a perfume he likes make sure to wear it. If you are eating out there are several suggestive things you could do with the right food. Lots of eye contact with a sexy smile ain't bad either.

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There's someone in my head, but it's not not me - Pink Floyd