You can look up the "baseball euphamism" (however that's spelled) on Wikipedia if you care. That's how I figured it out.
Roger that OOZ, thanks, they don't teach you any of this stuff in school.
I don't get the bases either, but I know 2 girls who were pregnant at 12 and another that was, well, easy. It's absolutely pathetic, and I don't know who to feel worse for, the girl, or the poor SOB that finds himself shagging a 12 year old...
I would feel sorry for the both of them, unless one of them was trying to ruin their life.