From experience I can say without hesitation that sailors swear far less than back of house in a restaurant.
Real conversations go something like this:
Just get your fucking finger out your fucking arse and cut the fucking shit the fucking way it's meant to be fucking cut and do your fucking job without being a fucking whinny little cunt. For fucks sake!
Or this:
The customer wants a fucking rare fucking steak. What the fuck do you call this pile of shit! it's fucking cardboard not a fucking steak. Cook a fucking rare steak of fuck off!
Maybe even this:
It's five fucking minutes before closing and they fucking come in wanting a fucking meal. We're in the process of shutting down the fucking kitchen and cleaning the fuck up. We have fucking lives other than being here for you beckon fucking call. Fucking idiots. Assholes everywhere.
Server to the customers: Hi, welcome to the restaurant. Have you dined here before? No no, there's no problem about coming late as the kitchen takes orders till 9pm and it's only 8:55. Would you care for some wine from our selection?
Sailors, at least cruisers don't swear much at all as their wives or girlfriends are around. I find it extremely sexist and offensive so I try not to participate in this discriminatory fucking practice.