ok, usually I mishear the lyrics from the male backvocals, and the problem is, there aren't always official lyrics for that, so I never really get to know what they really say.
during the bridge in RR21, he says something like
"Love Revolution, all together now, so..."
I keep hearing
"Love Revolution, all to get an asshole"
In Sexy Boy, at the beggining I hear
"Sexy boy, from outerland, sexy boy, IN YOUR MOUTH"
And in LALALA shiawase no uta at the beggining I hear
"M for baby, ok, let's girls!"