Looking back: on February 12, 2011 I posted math-poetry suggestions for Valentine's Day at this link: Loving a mathematician (Valentine's Day and . . . ). This posting from Feb 9 2013 offers verse along with an animated drawing of a heart-curve --a cardioid. And this link goes to a mathematically poetic digital art exhibit (that includes a cardioid) by Guang Zhu.
For even more poetry related to the love-holiday, enter "Valentine" in the SEARCH box to the right. Enjoy!