The optimal actions to achieve these goals is significantly different for males and females.

Are you speaking from an evolutionary context, i.e. claiming that what we understand to be optimal is hardwired, or are you speaking to which actions are actually perceived as optimal in our world?

You make a really good point---one I hadn't thought of but agree with---but since I don't think that we behave strictly in a manner that our ancestors would consider optimal (after all, what are we doing at this site?), I can't agree that sexual and social signaling's effect on motivation can be considered a-cultural.