My friends from a cabaret announced one a song of their performance in these words: "There are one million songs about love. Behold the one million and first song". This short, funny statement is a good illustration, how love is important for us. Love is a subject of uncountable number of poems, novels, plays, films, songs, pictures. I can risk saying that love is the most popular theme in art, the greatest driving force of human acting, and the most common dream: to love and to be loved. Love is something most desired and, sadly, most difficult to achieve.