Sausage Party won't be gaining any awards anytime soon, but you can bet is funny as fuck.
I think it was progressive in the idea that this is an animated movie aimed towards adults. There's this cliché about animation being only for kids but there have been really interesting and thoughtful animation movies catered toward mature audiences.
Granted, they all/most had deep messages or had some sort of social criticism.
Sausage Party is an animation aimed towards adults with no other objective than to entertain. And as an adult, I'm grateful for that.
The orgy was just for laughs, after all the innuendo thrown around everywhere in the movie.