It's rude, nasty and inconsiderate, but it will muddy the waters with the aspect of copyright over photographic images. At the moment copyright of all photos or videos rests with whoever took them, no matter who they are of etc, any attempt to alter the law to protect people from home made porn films will need to be worded carefully to avoid people being able to start making a fuss to make sure things they don't want to be seen about themselves doesn't end up in the public domain. I do think it's very innocent of anyone to think a porn clip of them won't at some point end up on the net, which is why if that thought offends you it need to be thought about very carefully. I wouldn't do it because I don't actually trust anyone that much, and I think it would be wise if other teenagers didn't either, but surprisingly nearly everyone seems to sext which I think is stupid ;/