Some behaviors are generally considered unethical, regardless of whether a victim complains. If you murder someone, that's (generally) unethical, even if the victim's family doesn't seem to mind. Saying the victim was too apathetic to care will not change the verdict.
Sexual harassment in the workplace is unethical, even if the (wo)man pretends to like it.
Sexual harassment in the workplace is unethical, even if the (wo)man pretends to like it.