There are a lot of final girls, if that is what you mean. But when he says inject something he means it is obviously forced and doesn't come across as natural.

Having Pamela Voorhees be the killer in the first Friday the 13th wasn't injected gender, she was meant to be a reverse Norman Bates and to shock the audience because no one was expecting a grandmotherly woman to be the one running around stabbing people randomly.