Once again I bring the notion of having the safety demo presented by bikini wearing female staff of suitable calibre. Guys will undoubtly look and the ladies will look to find what are the "defaults" on the appearance of the F/A.
Completely non PC approach but I feel it would work.
Seriously know, it is an issue of manners and the fact that by not observing it puts other's life into danger.
Rwy in Sight