What is this anime from a clip I saw?

There was this reaction video I saw on Youtube. The reactor was watching a scene where a girl and a guy are in a room and the girl was about to take off her clothes. I'm paraphrasing this bit but the guy asks "What are you doing?" And the girl simply answers "What do you mean? Sex". I remember the reactor's face with a wtf type face and him flailing around.

I remember reading the comment section and one comment mentions the name (I don't remember) and the premise, which was that the girl was used to having sex after every date because she thought it was normal. However, out male MC, the aforementioned first guy, does not want to and that in the anime, they are learning to be a proper boyfriend and girlfriend. I remember that it said it was actually wholesome.