Sometime last year, nudists started descending on the very visible parklet at Market and Castro streets, quite the spectacle for the tourists disembarking from the F-Line. On a nice day, expect a rotating cast of a dozen nudists to show up to read, drink coffee, or just shoot the breeze while brazenly feeling the breeze. The men — yes, all men so far — even voted to informally rename the plaza the Buff Stop after themselves. Some residents complain that the nudists are giving the gay Castro a bad name, but others applaud their only-in-San Francisco exhibitionism. (Local law allows officers to arrest nudists only if someone will sign a citizen's arrest card, which rarely happens.) Actually, a year after the nudists' arrival, the most common response to them is mere ambivalence toward the new feature in the city's, er, landscape.