The few times I've been to an SC with regular Joes, it's been agony trying to not say or act in a way that made it obvious that this wasn't some kind of "rare special treat" for me. For batchelor parties, I usually just lay low, have a few drinks, and encourage "the bros" to actually stage tip and not sit there giggling.
Then, on the way home, I'd hit up my favorite full service spa and absolutely wreck some poor girl.