Hello, I'm back again   Haven't seen you since I don't know when   It's been so long but you seem so cold   Is it something you've been told?      She said, "So this is what you think of me   Going with some whore somewhere out in Germany"   I said "Baby, baby can't you see   It's nothing to do with you and me"      Nothing to do with my heart   Nothing to do with my head   Nothing to do with our home   Nothnig to do with our bed      It's just B I O L O G Y   Can't you see? It's just biology   Biology, coming in between you and me      Your biology lesson starts here   And first of all we should make it clear   That the species known as males   Have these little white things with little white tails      Which multiply and start to shout   It's getting crowded down here, let us out   Once relieved they start again   It's not a process controlled by the brain      It's nothing to do with their hearts   Nothing to do with their heads   Nothing to do with their home   Nothing to do with their beds      It's just B I O L O G Y   Can't you see? It's just biology   Biology, coming in between you and me      She said thanks, I'm so relieved   What your saying I can well believe   Now I know, I feel no shame   About Dave and Tony and Phil and James      I said, "Baby, baby, this can't be true   She said "Well what's right for you   Has to be right for me   In any case I'm sure you'll see"      It's nothing to do with our hearts   Nothing to do with our heads   Nothing to do with our home   Nothing to do with our bed      It's just B I O L O G Y   Can't you see? It's just biology   Biology, coming in between you and me