I've wanted to for a while now, but, as most people, I end up backing out every time.
The closest I've got, is tasting my precum that is on my hand.
I've gone so far as to try and shoot into my mouth, but, the second I cum, I back out before anything, and my cum comes out slowly, so it never happens. Truly, only once have I actually squirted cum. Wish I could do it more.