I can cum (mostly) without jerking my dick I don't know if this is well-known or not but it feels VERY good. For me it works this way: i wrap my dick in toilet paper (to absorb the semen, condoms works also but feels not so good for me). Then i wear a tight slip and watch porn. After circa 30-45 minutes i'm so horny that my dick press against the slip and my legs begin to prickle and then start to cum, it needs 1-2 minutes to the end. But in this 1-2 minutes it feels so good, it's fantastic and feels so much better then normal jerking. 
I'm the only one who knows this and do this?