Valentine's Day has really nothing to do with St. Valentine, neither of them, as two rather innocuous St. Valentines claim this holy day on the church calendar.
Valentine's Day is really all about the birds, as Chaucer pointed out over 600 years ago in The Parlement of Fowles. By tradition, February 14 is the day when birds select their mates in preparation for spring.
Birdwatchers should be able to catch some avian porn today. Or at least some foreplay. And apparently the birds are screamers.
"For this was on seynt Valentynes day,
Whan every foul cometh ther to chese his make,
Of every kinde, that men thenke may;
And that so huge a noyse gan they make,
That erthe and see, and tree, and every lake
So ful was, that unnethe was ther space
For me to stonde, so ful was al the place."