The key is discipline. Having the discipline to pull out as you're feeling like you're about to pop. And then don't touch it. Don't grab your cock or touch it in any way. Let whatever gonna come out come out. Wait a bit and then start fuckin again. If you waited a few days in between loads, you might get a few shots out of it. Heavy cummers? Damn. Maybe 4, 5, 6 times. Depends on how long you can hold out!