Speaking of sex, Star Wars Episode Four, A New Hope. That's the original one that came out that same year, and my seven year old just watched it for the first time. Wow. It was great because he could be indoctrinated into a major pop culture icon of my youth, while at the same time, learn another important life-lesson:
"See, son, the pee-nee shaped x-wing fighter?" I mean, seriously, what's the head on that thing for? Armor? Feh.
"Well, it goes barreling into this dark narrow cavern-like tunnel. The pee-nee ship's job is to shoot a little thingy so that it will penetrate the large spherical Death Star. Watch Luke grunt a little sigh when he shoots his little thingy successfully." Really folks, you need to watch the scene in this context. I am not making this up.
"Then a 'chain reaction' occurs. The big sphere ultimately bursts into a thousand points of light, and all the good guys jump for joy!"
And that is where babies come from.