"Say the purpose of sex isn't procreation or recreation. 
 Say it's concentration. Say it makes you focus on the person 
 you're sleeping with, 'cause there's just too many other people 
 in the world. It's like biological highlighter. [...]  
 Look for me first, in any crowded room, and I'll do the same"
        --Lyle Lovett, The Opposite of Sex