In the world of Troilus and Cressida, men and women are expected to behave according to the kinds of gender roles that were typical in Elizabethan England at the time Shakespeare was writing this play. Basically, men are expected to excel at combat and politics if they want props from their peers. When a man refuses to fight in the Trojan War, he's accused of being "dainty," effeminate, and worthless. Women, on the other hand, are expected to be chaste, silent, and obedient. When a woman is sexually promiscuous—even if she had no choice—she's referred to as a "whore" and is seen as a threat. And if she's disobedient to her husband or father and voices an opinion of her own, she's dismissed as being "superstitious," "brain sick," or disloyal.
Female sexuality is portrayed as dangerous and threatening in Troilus and Cressida.
In order for men to have any street cred in this play, they have to go around eating enemy soldiers for breakfast.