Often, philosophers of love want to distinguish between romantic love and other kinds of love. Some appeal to sex in some way to make this distinction. Schopenhauer, for example, reduces romantic love to sexual desire alone; in fact, to opposite-sex sexual desire alone. He says, for example, that 'all love, however ethereally it may bear itself, is rooted in the sexual impulse alone, nay, it absolutely is only a more definitely determined ... sexual impulse. ... It is merely a question of every Hans finding his Grethe' ...