Loki calls Black Widow a "mewling quim" which as far as PG-13, superhero action movies go is worth the price of admission in and of itself.  I think Whedon may have found the MPAA's blindspot; Shakespearian slurs referencing female genitalia.

I've heard it said when Benedict Cumberbatch is not acting onscreen he's spirited away to a hermetically sealed bunker should a calamity befall the empire requiring repopulation.