Don't get me wrong, the sole purpose for my search of repertoire is not to 'pull birds' I too am a sucker for dramatic/romatic pieces. 
I am 19, and I can recall countless experiences where I've been at a party, there's a piano in the corner and I'm forced to play something for somem girl.
Hmm. There are several Chopin preludes that are very pretty and could appeal to girls...I'd have to look up the numbers. Not sure of they're necessarily romantic, maybe just pretty. Scriabin prelude 11/15 is very pretty, I dunno if that'd really work for playing at a party. You might also want to consider your ability vs your ability while drinking...you definitely don't want to play something at the peak pf your abilities then...
Liebestraum no. 3 is very well known, romantic, and pretty. Liszt Consolation no. 3 would be good too. And maybe, just for fun, the beginning section of Funerailles

Satie Gymnopedies, easy and pretty. Again, not necessarily romantic, but recognizable and not at all difficult technically.
Rachmaninoff's Vocalise could work. Try the Richardson transcription.
I'll try to think of others