For those of us who planned to spend our weekends doing some heavy-breathing prank calls, good old Darth stepped in to do some of the work for us. As it turns out, Anakin's the kind of perv who can go for ten hours*. *That was your warning.
Sources speculate Darth Vader actually wore the mask because he suffered from halitosis. Try watching Star Wars again, but with the heightened awareness that George Lucas never gave him a single sex scene.