maybe one reason some guys come so fast is that they are so stoked sensually that it's pretty easy for them to cum.
i know that once happened to me at an AMP - the woman was so pretty and sexy and her fingers and lips so light and sexily touching lil delites that before he knew it, he spurted before she even got to intimately play with him.
and as deliteful as that was, it precluded some additional intimate activites for some time until he recovered.
so, lil delites would much rather have a record-breaking "slow sensuous slurping tongue flicking bj" than a record setting "quick, done, and you're out of here bj".
[think an Inna-gadda-da-vida 15 min LP versus a short 45 RPM]