Why are many people ok with having sex with strangers?

I mean, I don't get why you'd be ok with allowing inside your body/ getting inside someone's body when you didn't allow them in your heart. I personally wouldn't be ok sleeping with someone I don't share some kind of connection with.

How someone would be ok with sex, but not sharing other personal stuff is beyond my understanding. I am curious on how other people view this. I don't have anything against you if you do it, I am just trying to understand the other person's point of view.
Why are many people ok with having sex with strangers?
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