*confession* Haven't even read the book. I spotted it -- at age 16, where my slash goggles had only developed to the point of thinking Ponyboy and Johnny needed to kiss during the "Stay gold, Ponyboy" scene and WTF was that all about? -- watching the original West End cast performing it.

Didn't hurt that Enjolras was smokin' hot, of course.

But despite them leaving it out of the musical in an overt fashion -- DAMN it was still there.