That’s an interesting perspective. I have never thought about it this way. I think the way casual sex is portrayed in the media and perceived by society usually goes the other way. Usually, if you’re incapable of enjoying casual sex, free of emotional investment, then you’re some kind of prude who can’t let go and enjoy yourself. People who want sex to mean more than a pleasurable physical activity are seen as the ones who are missing something in life. When you put it in terms of being emotionally unavailable and incapable of reaching a deep level of trust, then you’re flipping this whole notion on its head — and it makes a lot of sense.
Also, sex is such an intimate act. The simple act of getting naked next to another naked body involves making yourself vulnerable. I think this vulnerability scares a lot of people, and that’s when they try to distance themselves by not getting emotionally involved. It’s a defense mechanism.
“That meaning, they’ve never had the sex you are explaining and do not realize what they are settling for or missing out on.” — again, I haven’t thought of it this way, but it makes a lot of sense.