What does Yu-Ching Fei's joke "Five Spades" mean?

This is a pornographic joke. Hehe, it means that she attended a fancy dress ball, so she dressed casually. She only wore black shoes. Black gloves told her that she was five hands and five feet of spades, that is, four o'clock, plus the body hair of her lower body, that is, the midpoint, just like the card. Do you understand now? A little cold yellow joke.