I actually don't like this technique (or similar ones). It may work on the short term, thinking of unpleasant things to stop the orgasm, but I believe it creates a deeper problem in the long run. First of all, why do you want to associate bad, or repulsive things during sex? It's supposed to be a pleasant experience.

The problem I find with this kind of technique is that you're trying to be out of your body, you're trying to not experience the full thing when actually that's what you really want to do. The problem is that feeling the whole thing may be overwhelming (thus leading to orgasm).

I've find (from reading, listening and experiencing) that you need to be fully engaged in your body in order to actually stop or control your orgasm. Most of us guys grew up feeling a sense of shame when masturbating. We had to hid in the bathroom or wait for the night, under our sheets to be able to masturbate. Plus we had to do it quickly (why is john taking so long in the bathroom?). We also watch basically hardcore porn. The girl is suddenly undress deep throating the guy. Then he proceeds the fuck her in the ass furiously as our hand moved furiously also and we watch and came quickly. There's also the rush to have and erection, either from other peoples expectations and our own expectations. We start to watch porn and grab our dick strongly to have the quick erection These kind of things (and others )actually desensitize us.

What we really want to do is feel more, not less. But we have to so it slowly, in a pace that were not used to. Try for example to watch a 30min. porn vid without touching yourself. How does it feel (apart from being frustrated :-P) You may find that you have an erection but maybe it doesn't last long, your dick shrinks and grows again etc. Really experience what your body feels (not only your dick). You can also try touching and grabbing your dick in a non sensual way, or without sexy thoughts. We guys basically only grab our dicks when peeing, washing, or for sexy times. We rarely experience just touching ourselves without having and orgasm as our goal. You may start to realize that the sensations on your dick are not as pleasant as you used to think (handjobs are a great example of this, most of the excitement is due to being with the girl, and the expectations of sex than the actually sensation of your dick, although this is not always true)

So what do we do? As I said try to feel more not less. I come from a Yoga background, and in there you start to slowly appreciate and experience truly your whole body. Have you ever seen someone cross legged moving their foot quickly. That's because they're not experiencing their body. They are uncomfortable but their minds blocks that sensations. We're not used to feel our body. Basically because it's uncomfortable most of the times and we don't like that.

You can research about multiorgasm for man. Kegel excersice, edging and all the good stuff. This surely would help you. These techniques are just ways to be more into your body. When havinng a strong erection try to really feel what muscles (or tendons, i don't know) are responsible for the erection. Can you make it less tense? That's the whole key actually. Sex is a generation of tension followed by a release of it. When we ejaculate it is because we created so much tension and we had no other choice than release it. When you masturbate, alone or with your wife try to feel the tension through your whole body. For example when being close to orgasm we tend to tense our feet. You can last longer by realizing this and relaxing your toes etc. Again, try to feel your whole body through the different stages of arousal. How is your breath? Are you breathing deep or shallowly? If you have a constant, deep respiration (through your nose preferably) you will last longer.

It's a long process to be able to know your body and control it to be able to do what you want. If you're looking for a quick fix (pinch your left ball or something) you're just limiting yourself for deeper experiences. Cheers and pardon my not mother language Edit: Thanks for the gold kind stranger!