OD is great for the "pre-emptive I'll claim I've rejected you before you have the chance to reject me" strike 
Used to use match.com, good fun. Got an e-mail from one guy:
"It's a shame you're below my age range but if you're in X let me know and I'll buy you lunch. Oh you know I've got the same kind of dog as you."
I ignored it. Looked at his profile a few weeks later to peek at his dog photo . match.com shows if someone has viewed you. He e-mailed me straight away:
"Well I'm afraid you're not my type, and too young for me, sorry".
Or a few guys I've had 1st meets with text over and over again "as if we're actually in touch". I haven't replied to them for months beyond the first "sorry I'm getting back with my ex you're a weirdo" message 
Reckon maybe its "emotionally safer" to have an imaginary relationship in their heads. Like teenage girls being in love with One Direction or something.
Maybe these men have little pictures of our heads stapled onto hand puppets:
Squeaky voice: "Oh darling, I want an affair with you so badly. Take me now, big boy!"
Man's voice (sadly): "I can't, Cogito my love. I just can't."