Many feminists/femcels claim that women must necessarily keep their guard up around all men because all men have the capacity to commit sexual harassment, rape, or murder. They appeal to nature/evolution often, citing the sexual dimorphism of men in physical strength and testosterone.

If we take this to be true, it must also be necessarily believed that all women are sexually manipulative and deceptive by nature, since using such deception is the only way a physically weaker woman can leverage power over men. Therefore, men must keep their guard up around women for fear of being manipulated with sex, and nothing a woman says can be taken at face value.