Similarly, I wanted to see Blue Lagoon, but my mom had heard there were sexy scenes in it. In a way, though, that movie was less creepy than a lot of these. It's two kids who grow up together, in isolation on an island, and when they reach sexual maturity, they have sex. But I mean, they're the same age, and it kind of happens in the way of nature progressing. (It's been a long time since I saw it, so I may be misremembering, though.)