I once saw a scene from a rather mainstream movie, in which there was a newlywed couple having sex during their wedding reception. It was rather some kind of “hate-sex” as the groom accused the bride of cheating, if I remember correctly. I remember also that the intercourse took place near the wedding cake and the couple got somewhat dirty from it. Also, they did it in front of shocked / disgusted guests.
I can’t recall the movie language, I think it’s English, but I am not 100% sure. It is at least 5 years old (and in colour, of course).