There was a time when the only place to watch an uncut R-rated movie was at the movies. When cable reared its head, suddenly we could watch R-movies on television, but they were mostly rehashed moves from the theater.
The theater is nearly devoid of R-movies these days, but streaming sites like Netflix have a treasure trove of moves that you've likely never even heard of. I admit that when I first started with Netflix, I stuck pretty close to that main page. They have a bevy of choices that they think I'll like and they were generally right.