This 1961 public information film is complementary to "Boys Beware". Curiously, it does not seem to cause the same outrage, though it remains to be seen how it can be considered "homophobic" to warn teenage boys about plausible perverts yet common sense to warn girls about the same. Half a century and more ago, girls did not walk around with mobile phones in their pockets, there were not CCTV cameras everywhere, and girls did not mature so fast, so the warnings about sexual predators and simply slightly older youths who had lustful intentions seem a bit quaint nowadays. Nevertheless, it was and is still sound advice not to open the door to strangers, and for girls to let someone know where they are going, especially their parents.
There have been many similar warning films, videos and advertisements since; though nowadays they may concentrate on the cyberworld, the message is the same.