Sex Addiction in general I've noticed tends to center on those with high energy and a base of anxiety. As such, a lot of disorders even if not considered full blown addiction can begin to recognize intercourse as a way to self-medicate the mental disturbances.
From my brief time on speed I experienced what racing thoughts are like in a more positive headspace, and from that I can totally see why high energy types have less doubt in themselves and otherwise can't seem to hear other people; Their mind's racing so fast that they can't take in anything else.
Consequently you won't often find a sex addict who is prone to lethargy, usually they're twitchy or at least have an exercise habit. Sexual gratification for those more prone to addiction towards it tend to be over the Tension - Release model, using sex to force the release they'd otherwise had been clenching into up to that point.
A nymphomaniac I once knew used to try to curb the habit with cigarette smoke, and in turn was able to quit smoking through resuming sex. Turns out later in life that being prescribed a very low dose downer was enough to stop the tension building.
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