God speaking through Paul said:Therefore, if food causes my brother to stumble, I will never eat meat again, so that I will not cause my brother to stumble.
Basically, if anything I do will cause someone to sin, I should not do it.
So here's the theoretical situation. I say to one of my friends, "Hey, watch this movie, the 300." He watches it and sees the nudity and the sex scene and falls into sexual sin. By doing that, did I just sin by providing him the means?
What if I were to say, "Here's this movie, but if you struggle with sexual sin then you shouldn't watch it." But even after the warning, he decides to watch it anyways, and sins. Am I guilty?
Heck, what if someone reads this thread and thinks, "Ooooh, sex scene in the 300, I should watch that!" Did I just sin?