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Maybe if you are into the "have an orgasm so intense your motor functions temporarily shut down for awhile", you can be like /d/'s bitch and proceed with orgasm/ejaculation denial, stretching out your session for much longer.
I hear that eating spicy foods tends to add a bit more pop - that was an old tidbit from Peter North, I recall.
If you can get some stimulation near your perineum (what you refer to as the gooch) then you will get a heightened sensation, as that is partly where the sensation for a male orgasm comes from. I used to do that a lot, but not so much these days. The easiest way to do it is to stack up some pillows and roll back - though, that position is pretty compromising, so if you're going for the stealth wank then it probably won't work out so well.
If you are looking for orifice simulation, I hear that purchasing things that you can carve an orifice into and penetrate, such as a softened and warmed cucumber or a melon (wish I had that picture to post in accompaniment), you can get some interesting results out of that.
Some dudes and ladies are into the sounding thing, though I haven't tried that, myself. Any input from them probably would cover a goodly amount of ground in this thread.