I mean, it feels good… It’s just not sexual. I think when I sit around at the computer idly going, it’s akin to kids who are young, like beginning around 3-6, that you’ll see doing similar things. Freud (who had really great observations, really shitty explanations of them) even had an entire stage for it. It’s not because they’re imagining carnal relations with others or all the emotional attachments of a (sometimes nascent) relationship leading to lust that builds into a desire to violently make with the genital friction.