Why do some people refer to sex as "just sex", as if it was something completely insignificant and unimportant?

It is odd to me. Examples.
"a guy shouldn't think of cheating on their partner if their partner doesn't bother with having sex with them. It is `just sex`, after all".

Or
"there isn't really anything between us, we are just hooking up - it's `just sex`".

Or
"oh yeah, I wouldn't even consider dating them, but I would totally jump their bones. "

Why do people dismiss the importance of sexuality? Or is it really that unimportant and insignificant?
Why do some people refer to sex as "just sex", as if it was something completely insignificant and unimportant?
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