Never achieved this myself but I can certainly work myself up mentally to the point of a couple rubs, fuck, just a little pressure, and I come. If I could just maintain the willpower not touch myself I'm wondering if it is possible for me? I always become impatient, cave in, and have to touch myself. I know I can just about get myself there just by crossing my legs and constricting the muscles in my nether regions. Don't think that would count though as fabric from my panties and say, tight jeans, usually is helping with this hands off approach. I'd like to push myself over the edge on a boring plane trip or something with nobody being the wiser. However, I'm bit of a noise maker and I'm afraid everyone on the plane would know immediately if I have a really intense orgasm and totally lose control. That fear always holds me back.
I do remember watching this segment on some sexual science program in which they hooked up this woman to all these brain electrodes and under clinical conditions monitored her and she was able to prove to the researchers her claim that she could indeed achieve orgasms simply by thinking about it. The test proved she was telling the truth as the evidence showed heightened activity in the part of the brain that controls and produces orgasms, along with other physical signs.
Add I remember seeing a video a long time ago of some guy who never touched his cock for several minutes and then shot a load. Although you could clearly see him constricting groin muscles to get himself there.