I didn’t know this topic existed!
I know many people have an adversion against everything H-themed for whatever mystical reason, but personally I don’t find H scenes or H images of bad taste inherently. Nevertheless, I understand most people don’t like talking about it, so I don’t talk too much about it if people don’t want to.
Back on topic, basically everyone on the Internet says that H scenes in Key VNs are done very poorly. The only Key VN I played is Little Busters, so I can only comment about H scenes in it. Moreover, I only read through Haruka, Kurugaya and Kud’s, and I skipped through Komari’s because it’s in a bad ending and I don’t like bad endings.
They were added later. They’re not essential. They don’t add much to the story. They are quite sudden and end a bit abrutply in some cases.
But hey, I still enjoyed them. While they don’t add to the story, they help building intimacy between the characters, and I personally found them to be very cute. I also got aroused by them.
I’m not very happy about the fact that H scenes were cut completely from newer editions of Little Busters, but unfortunately I can’t say I don’t understand the motivation behind it.