All of them if they're not warmed up at 8 inches but not often if they were fully warmed up (ie after oral and fucking for 15-30 min). At about 8.5 it didn't matter how warmed up I could bottom out a lot of the times. At 9 I bottom out whenever I want to and recently I've been with one chick who was 5'10 and another who was 5'9. I'm referring to missionary, but it depends a LOT on the position.