i like to surf the internet looking at porn whilst masturbating and i wanted to keep my hands free and lengthen my sessions to 3 hours or more.
i found the perfect technique.
take a vibrating bullet..the type you get with fake pussy's..and sellotape it to your penis head, just above the base. sit back, relax and turn it on.
look at porn whilst the bullet vibrates and sends waves of pleasure through your cock...vary the speed to control the pleasure and tease the cock, turning it off when youre on the verge of coming..and then on again..back and to.
it's the best technique i've found so far...