Girls and Blackjack

Listen up, buttercup. This joke is comparing girls to the card game blackjack. The goal in blackjack is to get as close to 21 as possible without going over. Our friend here always *wants* 21 with girls, but he ends up 'hitting' (asking for another card) even when he's already at 14, which is a pretty good hand. Basically, he's saying he gets greedy and screws things up with girls.