"If you're not mature enough or too sensitive to endure it, stay home. "
I don't think the original poster is questioning cursing in relation to the maturity level of a person seeing it, rather than it being necessary to the play/musical it is being used in.
I do think the cursing in Jersey Boys was excessive. However, I don't think the cursing in Avenue Q was excessive.
"F***! It sucks to be me!" is just not the same any other way...
"How bout a little black dress?"~hannahshule
"I have a penis, not a vagina." ~munkustrap178