It's not just the sex scenes, it's the nudity which is everywhere. Personally I think we've had a few too many scenes in Lord Baelish's whorehouse, and I don't think they need to show people having sex or running around naked in every one of them to establish that yes, this is indeed a whorehouse.
Like in this latest episode, the scene with the crying redhead and Baelish was good, but before that were a couple of pointless looks at some randoms having sex. And then full frontal nudity to top it of. Don't try to tell me that was completely necessary for the story.
There are many more examples. It's not something that ruins my enjoyment of the show, but like I said I think it cheapens it somewhat. And I think I would feel awkward if I found myself in a situation where I wanted to view the show with family/friends :lol
FWIW, by "sex scenes" I do mean "nudity" as well.
With that said, with regards to the scene of some randoms having sex. Like I said, I do agree that HBO takes liberties with sex, but I wouldn't say it was unnecessary. How did we see those randoms having sex? Through the lens of both the random guy (looking through a peephole) and Baelish (looking through a peephole). So now we're apprised of another purpose of Baelish's whorehouse that we weren't aware of before... as a basis of information.
In both seasons there have been several inferences (both overt and implied) of men of importance partaking in the whorehouses. And now we know that Baelish has direct access to that crowd (and apparently lets others have access as well, presumably for a price). We've seen time and time again that the show constantly has small references that become magnified sometime later. We probably haven't seen the last of this particular dynamic of the whorehouse; regardless, "whorehouse as a source of information" seems entirely relevant to the overall narrative. As the show has displayed time and time again... information is power (except when power is power).
You also say there are "many more examples" of unnecessary sex/nudity... what other examples are those? And what do you think of the Cersei/Jaime and Tyrion/Shae scenes *not* being gratuitous? That's a counterexample that no one has yet to explain.
Remember folks... "gratuitous" means 'entirely unnecessary', *not* over the top. All of these sex/nudity scenes serve a purpose, and when they wouldn't serve a purpose, HBO does *not* resort to excessive sexuality.