I know I might get a few funny looks and might raise all hell with this comment, LOL, but I have found something very helpful to keep from cumming.
Im a big fan of soccer, specially the English league, so I take a team and come up with their starting lineup, then go on to another, etc etc....no, Im not thinking about the players, LOL, just the name.
This might help explain how I can last so long. Ive noticed just coming up with a few names can help the feeling go away for enough time where you dont have to worry.
My girlfriend looks as happy as a pig in a puddle of manure and I come out smelling like roses.