There is a robust history, dating back to the Peloponnesian War, of tagging ships with affectionately vulgar names. Sailors would make up songs about em: "The Chillicut
is a dirty old slut with a growing swell behind her", or similar. Really, sailors haven't always been presentable, and after six months boiling whales and scrubbing decks I reckon a filthy hoor starts sounding pretty good, the filthier the better. Part of the odd, testy thing sailors have with their boats. Pilots, too -- it doesn't make the expurgated histories (Greatest Generation, Titanomachia yadda yadda), but some of the planes in WW2 had really disgusting nicknames and nose art. Like, really truly naughty.
Wouldn't care to name my boat thus, but... let's please not go moaning it's part of a general decline in society, murr murr murr. "Let me take you by the hand / and lead you through the streets of London" circa 1815. Or Nantucket, same time period. You'd heave your guts. No one back then would have given "Filthy Whore" a second thought. Nor noticed a well-dressed gent, puking in the street.
I agree with those who prefer a straight-up salty name over a cutesy one: High C's (note misapplied apostrophe), or Juan of a Kind. You want a general decline in moral standards? Look in the phone book under "Hair Salons." A Cut Above. A Snip In Time. Hair Today, Gone Tomorrow. There's
your sign of impending doom.