Here we will frequently employ the terms eros and sex. Eros refers to the desire or experience of attraction between the sexes, and can also be called ‘sexual love,’ although the term love as used in modern language has many meanings, many of them contradictory and which have nothing to do with sex. Thus, we will prefer the term eros when speaking of this kind of passionate love, which is, we stress, not a conscious determination but rather a desire, feeling or experience. The term sex, on the other hand, refers either to copulation itself or to the duality of human nature presenting itself as male and female. Eros and sex are therefore complementary terms, the latter describing a specific act and the conditions that make it possible, while the former describes the force which motivates it.