As overused as it is, the f-bomb has little power to shock and awe in the theater today – unless it is coming out of the mouth of a cute, furry puppet. Then it still has a shred of shock value left.

It’s like visiting “Sesame Street,” but taking a quick a detour into adulthood down some grittier New York City neighborhoods. Seacoast Repertory Theater’s production of “Avenue Q,” which opens Friday ...