Actually, this is how stupid one could be. I still crack up telling it. After about an hour or so of sex, I would get bored, considering the 1/2 hr to hour of foreplay before the sex. So I would start going limp inside her, so I would just say I came.
She'd look at the condom, and I was able to convince her that the lubricant at the bottom of the condom, very little amount was cum.
Considering there was a difference in amount when I actually came. That's about the best one I've ever given!
jDoG