By day it’s family-friendly, by night it’s adult only. The Super American Circus and its R-rated version, Cirque Risque, return to Atlantic City this summer after a successful run last year. Just off the Boardwalk right next to Showboat high flying acrobats, wire walkers, superheroes and clowns will be replaced a few hours later with scantily clad silk performers, contortionists and adult comedy. “We’re back,” said producer Tuffy Nicholas during a rehearsal under a yellow and burgundy tent Wednesday evening. The circus begins June 16 with the family-friendly version leading off at 4:30 p.m. fo…
