See, I felt that every scene, from the orgy to the babies being born, was set there for a reason. There wasn't really anything that I saw as strictly gratuitous. Even the possibly most gratuitous shot (Wolfgang showing up to Kala's wedding in the buff) was still worked in so that it made sense within the story (the visual of Wolfgang Jr, coupled with the stress of the wedding day, caused Kala to pass out, which furthered the story of the wedding not going forward anymore).
J. Michael Strascynski isn't one to go completely gratuitous. In fact, he balked at one of studio requests for Crusade, which was to have a crew member on board whose entire purpose was to have sex with a member of every alien species they encountered.
No, what I got out the orgy scene in particular was something that tied in well with the 4 Non Blondes scene. Specifically, that if two or more sensates within a cluster are experiencing the same thing at the same moment, it will almost uncontrollably bleed over to the entire cluster.
Remember that when Wolfgang got up onstage to sing "What's Going On" at the karaoke bar, Riley was also listening to it on her music player. This is why the rest of them had the song in their heads and couldn't get it out. Sun was singing it in the shower. Will was singing it on the train in his sleep. Lito was singing it in bed with Hernando and Daneilla. Capheus was singing it while driving his bus. Kala really got into it and wound up Visiting Wolfgang at the karaoke bar. Even Nomi, who was being prepped for an involuntarily lobotomy and scared out of her mind, couldn't help but sing along to the music.
The orgy scene was due to Lito's getting it on with Hernando while Nomi was getting it on with Amanitra. Because of it happening at the same time, there was the same kind of bleed over, but when you're talking about romantic lovemaking (Nomi and Lito are in quite serious and loving relationships, not just meeting someone for a booty call), there are some extremely intense and even primal emotions and thoughts going on. Of course it's going to bleed over to the others with a greater intensity than a song would.
And yes, the show does push boundaries. What I like most is that it pushes those boundaries without yelling "HEY, LOOK AT ALL THE BOUNDARIES I AM PUSHING!!!"
As I stated before, everything feels organic, and the characters are all fully fleshed out and, most importantly, real. There are no "Token X Characters" on the show. They could have gone with baseline stereotypes like "DJ with a drug problem" or "buttoned-up female Korean executive," but they didn't. They took baseline character ideas for each character and molded them into complex characters that we can actually like and even identify with. That, to me, is the greatest success of this show.