Good points. We shouldn't provide so many  prescriptions for falling in love. Who knows, maybe history will show that our greatest sin was literally limiting love, claiming--in our best intentions, our ignorance, or our bigotry--it was somehow our call who couldn't fall in love with whom. 

The Book of Love is full of fantasy, poetry, music, agony, ecstasy, history, and passion. It is a sin to try to turn it into a rule book or a how-to user's manual.