A day late....
skepchick has posted some Darwinian Valentine's Day cards. Things like:
Your secondary sexual characteristics bring all the boys to the gene pool. Have a look; it's a cute idea. (But they're not nearly as funny as I'd hoped!)
Ever better is G. Pullum's Language Log post from last year:
The Prescriptivist Valentine.
("And remember, when a grammarian kisses you, you stay kissed").