@snesboy
Top and bottom are synonymous with pitcher and catcher respectively. At least around here they are. I suppose local slang may differ, but to be a pitcher is to be a top.
@saphi
Think about sex. Think about the necessary actions that surround sex. Now while you have that in your mind try to label someone a pitcher, or catcher. I suppose knowing that top and bottom work in the same fashion can help your imagination work this riddle out.







