Yes, when I was a kid, if two people kissed, they loved each other. That's how my conservative Christian parents raised me. It's oversimplified, the same way nearly every original lesson is that a kid is taught in school or at home.

It doesn't matter if it's true, it's a good lesson for kids to learn. Kissing is an expression of love, not meant to be done with just anybody. It's not true, but it's a nice direction to point a kid in-- at least, that's why I assume my conservative Christian parents taught me that.