With masturbation for me it involves intense mental gymnastics experience. I'm generally imagining myself in a thrilling sexual situation I often fantasize about. Many times I use visual stimulus in the form of porn, often sent to me during erotic online talk with friends. This causes my wandering imagination to kick into overdrive, and before I know it my back is arched upwards, an intense feeling of bliss and euphoria washes over my body like a giant wave, and then soon after regaining consciousness I notice my bed sheets are soaked.
Damn that was good!