If I remember correctly the first movie rated R I ever saw was either The Shining or Rosemary's Baby.

And thus began your slow spiral into the darkness of Yoggoth..

:lol

To be really technical, my first was Braveheart, though I saw it when I was still in the womb according to my mother.

It was either Terminator or Robocop, I can't really remember.

Robocop

Mine was one of the Scream movies and that was a bad night for me lol

Mine might have been The Matrix?

Spawn, right after it came out on VHS.

I don't know HOW I managed to convince my mom on that one.

Wasn't Spawn only PG-13?

The regular version was indeed PG-13. As I recall, though, the director's cut was R.

As for me, my first R-rated film was 1981's Tarzan, the Ape Man.