The best Jacking experences for me are in the shower. This is a way to make your fun longer and orgasm harder.
Before getting in, stand in front of the mirror jack off almost until you cum then stop. Continue with your shower like normal but stop every few miniutes and jack off until you almost cum (you don not have to leave the shower). Do this 5-6 times and then finish. It is a good idea to lay down when you finally finish your orgasm because you knees will buckle and you could slip on the wet bottom of the shower.
After you have the orgam keep pumping for a few seconds, this keeps the involentary movements coming.