Mumble slaps Gloria's rear, towards the end of "Boogie Wonderland" ("No, it's 'MAMBO', OH!") as they're dancing together and then, throwing subtlety out the window altogether, she all but grinds on him.
When Gloria starts singing "Boogie Wonderland", accompanied by Mumble's tapping, the beginning is pretty freudian with Gloria singing slowly at first, then faster and faster while the song and background chant intensifies, until she ends up shouting "Yes!" and panting heavily. Wow.
Curse Cut Short: Lovelace, in response to the barrage of questions Mumble is asking him, claims to hear the "mystic beings" telling him to tell Mumble to "Go f... - forth and multiply".