The reason it hurts is because Joe has contracted an unmentionable disease from Lucille (who features in the next song
) not for the reason he thinks, or gives, here. The vocals are supplied by Ike Willis, a long term member of Zappa's entourage who shared his sense of humour.
"Why Does It Hurt When I Pee?" runs to 2 minutes 36 seconds.
Alexander Baron - London, England, for above 2