For those curious about Bad Sex....Bad sex examples, although, I may be viewing the situation from the wrong perspective now. Maybe it is more of a learning curve deficit??
Nonetheless, examples: mediocre and unengaged foreplay where you just don't feel like the true focal point (the person is touching you yet has his eyes closed and is almost just going through the motions to get the job done), he's not reading your responses or reactions to the way he's touching you, they get lazy mid-sex and do this sordid hip thrust movement that does nothing to stimulate any part of the female anatomy, it's over in 2 hot minutes and he climaxes first--leaving you orgasmless. Just a couple of personal experiences from the past to make it feel "bad" lol.
Good sex, of course, any time none of the above was taking place. There was actually raw passion felt, all focus was on me at the right times, there isn't a single inch of me that doesn't get touched or explored, the mattress is usually knocked off kilter afterwards and needs readjusted (always a great sign), orgasms are fulfilled, and last but not least, sore stomach muscles and aching hips are a huge sign of a well played night!!