TabScout.

"Rein raus" (meaning "in, out" in German) is sung by the German metal band Rammstein and is a song about sex. The lyrics go as "Ich bin der Reiter, Du bist das Ross, Ich steige auf, Wir reiten los" (I am the rider, you are the horse, I climb on, we ride off) and "Der Ritt war kurz, Es tut mir leid, Ich steige ab, hab keine Zeit, Muss jetzt zu den anderen Pferden, Wollen auch geritten werden" (The ride was short, I am sorry, I climb off, I have no time, Now I must go to the other horses...