Copyright Registration Opinions?

[St Marc]

Here's a question, odd as this may sound coming from an intellectual property lawyer, regarding copyright registration, for those of you who do it.

Do you register all of your pics? Just the edited ones? Do you filter them according to subject matter? For instance, if you shoot erotic art, do you register those as well? Let's assume, of course, that you don't have any work which is clearly obscene (which you would be ill-advised to register,) but that you might do some which pushes some boundaries. If you shoot content for erotic websites, does that change your opinion?

Not looking for opinions on the law so much as what you do and why with regard to your registered material.

M