Neither motion sickness nor intestinal parasites are crass and vulgar.
Adams is being facetious when he tells him about the "Satanic sex orgy", telling him that they're just teasing him because he's an outsider.
We've watched every episode up to this point and, yes, it's dumb, but one of the things that's been striking to us is that there is virtually no objectionable content.
You have a low bar for entertainment. Here's the exact quote from John Hancock:
"Well, I'm gonna amble down to the creek, take a sip of the cool water, contract a parasite, and diarrhea my brains out."
So, "diarrhea my brains out" is not crass and vulgar. M-Kay...
Oh and I had forgotten about the gay British soldier who professed his love for Jeremy after he was shot. I also remember a scene where one of the characters places his hand on Paul Revere's daughters breast.
But, not objectionable you say.