This may be treading old ground, but what stops media separation from being a solution? There's already media that caters to boys, so all that's really needed is more media that caters to girls.
Separate but equal? I think we've tried that
Seriously, though, all segregation does is perpetuate sterotyping, and as I pointed out above, male intake of media that sexualizes or marginalizes women impacts how males view and treat women, so again segregation of media leaves a problem.