I don't know what KY Intense is, but i can imagine that kind of commercial, and it is funny but we men need to convinces ones self over and over again, and it can be quite comical. I mean i do like to count scratches on my back the next day and many other silly things that kind of assure me.
But i just find the idea of having sex with a girlfriend, while she is already totally turned off and is not enjoying herself anymore and i am just looking at my watch thinking, "man 12 minutes to go for a new personal record, i am going to make it, i am the man!" so ridiculous. It is such a laughable idea, i just can not see that happen, its not like i don't like long sex, i want to spend as much time that way as i can, but i am just convinced that when it is enough for either one the other one feels it and reacts. If i feel she gets uncomfortable, and maybe sore i just start doing something different and therefore just have a hard time how one can actually go to long, i guess that is only possible if you are really more focused on your watch than your partner