Everybody's gonna think this is weird, but here goes.... If you're never had a girl give you a _gentle_ prostate massage while blowing you, you don't know what you're missing. Esp. if she really likes lots of your cream
Lots of guys might think this sounds "gay" but:
Get her to lube her middle finger up really well with KY, then slowly slide it in. (She can wear a vinyl exam glove if she wants

) She should _gently_ feel up inside and a little toward the front. In the center, she should feel a hard, walnut shaped bump inside you. That's the prostate, which produces pre-cum and the fluid part of your cum.
When you get to middle age, the doc will feel this to make sure you don't have prostate cancer. Every guy dreads the exam because it's uncomfortable and weird to have a guy stick his finger up your ass, and because the prostate is _very_ sensitive and it probably hurts to have it digitally examined.
BUT if a girl does it carefully, gently stroking and lightly squeezing it, it can make you cum harder than you ever have. A mind-blowing orgasm. And if she knows what she's doing, it won't take very long.
So that's why the prostate is helpful for a quick finish.
I hope I didn't go on too much.