LOL! 12 Fraternity brothers on a cruise ship during Spring Break... There will be no shortage of available college females onboard, I'm sure! You won't be at a loss for things to do; rather finding the time to do them all will be your biggest issue. Wander the decks, hit the pool and the bars. You'll meet the girls right away - some even seem to have "AVAILABLE" signs posted on their foreheads.
If you're really going, have lots of fun. Leave piggy behind - he'd get in the way in the cabin anyway. And the girls won't like you if he's cute one day, dinner the next.