So if you've got a vacancy for a taxi driver in Seattle, you target your advertising at the following categories:
current or former job as "driver"
interest in "cars"
you don't target
What's the problem?
It would be illegal in most countries of the world for me to go to an agency and ask them to recruit me a male developer for a role, why would it be acceptable for me to ask for an advert to be targetted only to men? It *is* the 21st century....