pornopatch
n. The obligatory sex scene in a movie or book.
Also Seen As
porno patch
Etymology
pornography + patch
Examples
2006
Shortbus Life, love and sex in the New York City of the ultra-cool.

Porno patches shocked some at Cannes, but this one isn't for the prurient; well-acted and good direction from John Cameron Mitchell.
—Derek Malcolm, “Best of the festival,” The Evening Standard (London), September 14, 2006
1985 (earliest)
pornopatch n. A gratuitous passage of explicit sex inserted in a novel by an author or editor to give the book more selling appeal.
—David Grambs, “Literary Companion Dictionary,” Routledge, February 21, 1985
Posted: April 19, 1997