I tried looking it up, but even Wikipedia seems to suggest this is not the case[1] Do you have any reference I could look at?

[1] https://en.wikipedia.org/wiki/Affirmative_action_in_the_Unit...

EDIT: Also I believe it's legal to post in a (wo)men's magazine, as long as you post in the other gender's magazine too (e.g. you can't focus on only one demographic)