It's always been my personal take that there's not actually a such thing as casual sex.. what's casual about stripping down to nothing, showing the parts that are always under wraps to others, and making noises you wouldn't dream of making in front of another person even for a theatrical production? It's a highly personal experience..
But for those that are able to see it as being definitively casual, I think it's possible that among other things narcissism could factor into it (so that the activity is viewed as centering around themselves and not both people), and potentially dissociation (they're there but they're not there). I do have some dissociation tendencies, myself, but for me it doesn't happen during that kind of activity.. I'm more meta-present in moments like that. 
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“We use our minds not to discover facts but to hide them. One of things the screen hides most effectively is the body, our own body, by which I mean, the ins and outs of it, its interiors. Like a veil thrown over the skin to secure its modesty, the screen partially removes from the mind the inner states of the body, those that constitute the flow of life as it wanders in the journey of each day.”
— Antonio R. Damasio, “The Feeling of What Happens: Body and Emotion in the Making of Consciousness” (p.28)
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