What does "bad sex" mean?

Anonymous
I see that so much, and I don't understand. I'm not a virgin, but I've only been with two guys in my life by the age of 20. Both times, sex was the same. I mean, it's just sex, right?
How can sex be "bad"? I know it also depends on the feelings and blabla but the mere "action" of making love to someone--how can that turn bad?

Thank you for your answers !!
What does "bad sex" mean?
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