I like them since it's an opportunity to see relationships without being left out of anything, but it often annoys me that there are lengthy R18 scenes when I just want a story to progress. I guess it's good for me only in moderation.
I may like them if the romance is well developed prior to such scenes, and prefer creative to vanilla smut. Sometimes even kinks are interesting, but non-con/rapes are always distasteful.
Well, I usually come for the plot and the characters, but find that the best ending is the ending with R-18 contents lol. It's the best thing that fulfills the entire story.