Unlucky Radish Occupied the Seat Again The Scum Shou’s Survival Guide Perfect Destiny Transmigrated into the World of “Demon Lord Wu Zun”- I like the ml here. Unlike the ml from the smile from the villain, although ml here is really evil, paranoid and possessive, he just unleashed everything after mc died. Mistakenly saving the villain Reader and Protagonist definitely true love I’ve Led the Villain Astray, How Do I Fix It? It's Shou and gong in Chinese.
Seme/Gong is basically the Top or Dominant; Uke/Shou is the bottom or submissive. It's a bit more involved than that given there's usually expectations and other tropes attached to them, but that's the basic gist.
No, not really; quite the opposite, even, depending on the work. I'd go into details but this isn't the thread for that, so I suggest googling explanations instead.