Why is a family resemblance definition necessary for talking about sexual harassment according to Feary?

$1$ because harassment is about the family ultimately

$2$

because the Supreme Court has declared that $$a captive audience$$ applies only to the home

$3$ because society works like a family, not like a business

$4$ because necessary and sufficient conditions don$$t work

$5$ because this is the only way to get at the necessary and jointly sufficient conditions