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These can be done in conjunction or alone:
1. Temporary abstinence (1-2 weeks is optimal, any more causes lack of libido and diminishing returns)
2. Alcohol
3. Lube, especially saliva
4. Edging / prolonging the orgasm
5. Introduction of novel stimuli, most easily - (1) pornography that you haven't seen before (2) fetishes, like incest, rape etc...
6. Full embrace of the orgasm once it happens, continueing to masturbate somewhat into the orgasm
7. Pulsating with your glans muscle (not using your hand) through the orgasm