Yes, my own only. I don't have any desire to taste another guy's cum, though.
First time by accident when I was about 18 years old and I was laying back on the bed and I ejaculated so far that it hit me in the face. That kind of grossed me out, but I wasn't expecting it at the time. Since then, I have read about it, and it's no longer disgusting to me.
First time that was intentional was my wife kept it in her mouth after a BJ, and then kissed me and gave it back. Pretty erotic! I've licked it off her tits and stomach after cumming there.
Since then I've kind of developed a liking for it. And I will frequently (though not every time) cum into a shot glass and then drink that down, when I'm jacking off on my own. The taste is pretty good, but it depends on what you've eaten recently. I don't smoke, and I eat relatively healthy - lots of salads and fruit. Asparagus makes it taste really bad, though.