This is a variation on my sink technique http://solotouch.com/contri.php?t=t&mo=200508&cat=12 and works best for uncut guys
Place your hard cock on the edge of the sink. Start thrusting so that every time you thrust, the cock end is exposed. Then gradually lean forward as you are thrusting, so that your cock is sandwiched between your belly and the sink. It is a great feeling having your cock ride against your belly skin and the sink. In no time my cock is dripping pre-cum, which adds to a great sensation. I thrust and thrust. Seeing the glans of my fat cock exposed each time and each thrust is soooooo good, my cock seeps pre-cum. I stop and wipe the pre-cum off with my finger and either wipe it on the underside of my cock head or I lick it, as it makes me so horny. I continue thrusting and my cock hardens as I thrust. I am blessed with a 7.5' cock, which is 2.5' diameter, but I am convinced my cock grows in length and circumference even more as I near orgasm and then II shoot loads of cum all over the sink. I thrust until all the spunk is in the sink and I then clean up with a tissue.