For an LJ avengerkink prompt:
Steve is very confused/weirded out by the distinct lack of pubic hair on modern women (or at least the women Tony has forcibly exposed him to). Sure he's a virgin, but he's seen naughty pictures/European burlesque shows. Therefore he's more than a little apprehensive when Natasha finally gets her panties off. Luckily she's a firm believer in giving her partners something to hold on to. Steve goes wild.
+1 - it happens during group sexytimes and all the others stop what they're doing to watch Steve eat her out