Yes, this is my thinking, too. In the world that the show presents, with a situation that "deserved" punishment, there really wouldn't be an expectation of needing consent, right? I mean, it's not my favorite scene from the book, but it does shade Jamie's character a bit and gives the reader/viewer a chance to be frustrated by him. The show probably played it too much for laughs, but since this episode was his POV, I was more ok with it.
The scene with Laoghaire, on the other hand, really made me irrationally rage-y. I really can't stand when heroes/heroines are tempted to cheat with characters who seem to exist solely to mess things up for other people. Granted, I do think the fact that he didn't blow her off right away was probably realistic and right for the show. And it seems like the show is trying to flesh out the character a bit so that we don't just see her through Claire's eyes. But I could definitely feel my blood pressure rising during that scene. I think we also missed a bit of Claire's fretting over Laoghaire and the nature of what her marriage with Jamie will be, since we were in Jamie's head and not hers. It seemed like the show could have taken its time a bit more with this part of the story because it's a real turning point in their relationship.