Exactly. I agree completely.
LOL I super disagree with the "creaking of the bed" thing. The incest genre is best with dialogue, exploring the taboo nature of the situation. Without any talking, it's not any different from normal sex. That's why I think this is the genre that benefits most from subtitles. It's a shame there's a lack of English ones out there.
Though I do agree, great acting takes the genre to another level.