Robert Burns compared his love to a "red, red rose." Shakespeare thought his was more like "a summer's day." These guys knew how to write some serious poetry; after all, they came up with some of the most romantic lines ever penned.
Don't roll your eyes. You might dread the thought of using iambic pentameter in English class, but poems are actually a great way to get girls. For centuries men have written and recited poetry to articulate their feelings about the women they loved, and their lyrical efforts really paid off.
Your words don't even need to rhyme to count as poetry. Just jot down your feelings into a few simple lines, like this:
Your eyes dance like fireflies in the moonlight Your cheeks glow like stars Your lips are like two waiting pillows For my lips to fall upon
One piece of advice, though: you might want to skip the poetry writing if your best efforts read something like this:
Your rack's beyond compare Large and round like melons Your hind view's even better So nice I have to stare
In that case, you're better off leaving the poetry to the pros and just carrying your book of Shakespearean sonnets on the date with you.