The bullfight also represents the dangers of sex and love. The bullfights are described as seductions, in sexualized language (it is a fight after all, in which a man tries to stick a long hard object into the bull), and yet it always ends in destruction, of either the bullfighter or the bull. Similarly, Belmonte is cast aside in the affections of the fans as soon as someone better comes along, in this case Romero. The fickleness of the crowds mirrors Brett's behavior, as she jumps from lover to lover.
Bullfighting Quotes in The Sun Also Rises
"Nobody ever lives life all the way up except bull-fighters"
– Cohn and Jake