All I know is that I can't ever orgasm without something touching my clit. Maybe I have like...once or twice...but it's fairly necessary.
So to sum up:
Oral - I like this better than sex and am usually gone in about 10-15 minutes.
Vaginal Sex - Usually around 30 minutes, sometimes faster, sometimes slower...depends on the guy or position.
Anal Sex - 15 minutes-ish. As I said, I need serious clit stimulation...and if I have that, along with the anal sex, I can go pretty fast.
You can't live in the past, because you've got to live for the future.