I'm a cum machine, so yes, I've been able to lol....But honestly I cum quite a bit, and it's pretty easy for me to cum without touching or anything.
I tried this before: I'll get a raging hardon then think about cumming, devote every bit of thought to it and flex (?) my cock to where it feels like the head is about to explode but had never been able to cum before.
I tried again tonight and came like I was putting out a fire. I think it just took practice. We'll see.
Anyone else with any experience in this area?