Do you mean porn movies or regular movies or both? And how long is long? For regular movies with really long hair, "Lady Godiva" (1955) with Maureen O'Hara comes to mind. It's a wig, of course. Dorothy Lamour had long hair in some of her movies:
Lots of movies with Jane Seymour, of course, such as "Somewhere in Time". I haven't seen "Long Hair of Death" (1964).