divided we fall, united we stand

today we watched some videos in anatomy about safe sex and STDs.
One video was from the 80s and was asking young people what their impression of abstinence or safe sex was..
anyhow, the end of the clip was of two young boys, probably around 10 years old.
the one boy kept going on about how if you know a girl and you know she doesn't have any disease and you both want to do it then of course you would do it. then he went on to say how you should use a condom and a diaphragm. His last comment, in reference to using both a condom and a diaphragm, was "divided we fall, united we stand"

the class exploded at this point

I was in tears

Divided we fall, united we stand - use a condom AND a diaphragm