Marriage is a two-headed transplant   Sometimes that's how it seems   When the sex wears off, it's all give and take   And it's goodbye to all your dreams      One head wants to go to a movie   While the other wants to stay at home   And just like a two-headed transplant   You get the feeling that you're never alone      Mr. and Mrs. Horrible are an example of what I say   They used to be so in love, now they fight so much   That they've frightened all their friends away      They never get visits from neighbors   They've alienated everyone   And what started off as all cuddles and kisses   Has finally become      A labour of love, labour of love   The torment, the worry and woe   Love's full of fears, bruises and tears   That's the way that a true love grows      It's a labour of love, labour of love   It's a struggle without a doubt   But if they keep on trying, screaming and crying   Somehow they're gonna work it all out      It turned into a two-headed transplant   But it started off with, 'Here Comes The Bride'   But cut off one of the heads and you'll soon find out   That the other just couldn't survive      Because they couldn't stand to be separated   They still each other's to have and hold   Anyone who thinks the transplant is easy   Really ought to be told      It's a labour of love, labour of love   The torments, the worries and whoas   The battles, the fights, the bruises and bites   That's the way that a true love grows      They took the vows for better or worse   And they had it blessed by heaven above   But what started so brightly as a tender romance   Turned into a labour of love, turned into a labour of love