Sandy Berman has renewed his call for the Library of Congress to create a subject heading for Sexting, citing an article inspired by Congressmember Weiner's travails called "Sexting: It's More Common Than You think."
You can see Sexting first proposed by Berman in April 2009 on his Personal LCSH Scorecard (page 7).
LC surely can't claim that Sexting isn't a relevant heading for their patrons!