This is a good one for guys if you want to taste your cum before you ejaculate, but after you ejaculate, you think its a stupid thing to do. First, wank for as long as you like however you like without cumming. Then, when you want to cum, just before you reach climax, position yourself on your back (it may be more comfortable to do this on a bed or on some padding). Next, lift your butt off the ground and get your feet over your head. All that should be touching the ground should be the your back and your neck. Your penis should be nearly directly above your face. (Don't stay in this position for long-it can cause discomfort in your neck and may cause it to be sore for a while.) Now try to climax as quickly as you can, using any form of strokes. If you're almost there to begin with, it won't take long. Keep your back as straight as possible, with your stomach in (and with a little directing from your hands), and you'll get a faceful of cum.
NOTE-DO NOT TRY THIS IF YOU HAVE BACK PROBLEMS.