Females should strive to be feminine.
No... They should strive to be whoever it is they'd like to be - feminine or not.
***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.
Females should first act, then we can actually define "Feminine"
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.