Females should strive to be feminine.
Females should first act, then we can actually define "Feminine"
No... They should strive to be whoever it is they'd like to be - feminine or not.
Females should strive to be their best selves. If, for a particular person, that entails being more feminine, then my answer is yes. But as a blanket statement, no.
***if they want to. Guys are also allowed and encouraged to be feminine of they so desire.
I think so, but that doesn't mean that they can't enjoy manly things.