Clan of Xymox the river

What makes a man?
What makes a woman happy?
What makes you think?
What make you say love?
Some say it's like the river
How it runs to the sea
Love could be my river
One million people
Hoping to find the river
One is in the middle
On the bottom of the sea
Like a spine of a tree
It's all a riddle, it's all a riddle
To me, to me