The male is also subjected to analysis, in an amatory direction, according to physiological and erotic categories. The most personal, the most intimate, the most normally cryptic and unspoken matters are subjected to forthright description and comment. For example, one subject discussed with the utmost candor is the intensity of the male erotic potential and his general reactions to sexual conjugation. Embraces and their varieties of erotic significance, postures and degrees of proximity and physiological contiguity come under observation and exposition. Especially the thirteen types of kissing, each in its own way symptomatic of the intensity of the passion. The art of kissing was itself so important in both ancient classical and Asiatic eroticism that, in the Middle Ages, it reached a literary climax. Johannes Secundus, a Dutch scholar, wrote a passionate amatory sequence of Latin poems entitled _Basia_, Kisses, in which he exceeded the lyrical surge and sway and the pulsating exultation of the Roman poet Catullus. * * * * * In the course of his surgical and medical experiences in various countries, notably in the Orient, Dr. Jacobus X, the French army surgeon who is the author of a voluminous corpus of anthropological matter entitled _Untrodden Fields of Anthropology_ (2 volumes. Paris: Published by Charles Carrington: 2nd. edition, 1898), the author gathered a great deal of unique and miscellaneous and little known information on sexual practices. In discussing potions, he dwells on cubeb pepper, a popular item in the love philtres of the East. A drink in which the leaves of cubeb pepper have been steeped, according to Dr. Jacobus, produces pronounced genital excitation. * * * * * The Arabs were astoundingly prolific in producing manuals on erotic themes, ranging over the entire field of sexual practices, normal and perverted, to which man is physiologically bound. The attitude adopted in such handbooks, however, is free from the contrived prurient or lascivious tone that might possibly have been expected, particularly in relation to occidental erotic literature. There is apparent, on the contrary, a certain reverential humility, as of one who treats a sacred subject for which supreme gratitude is to be accorded to the ultimate and beneficent Maker. In this sense, therefore, erotic matters have inherently a sanctity that is acknowledged by the Arab writers again and again. As in the case of the Sheikh Nefzawi’s _The Perfumed Garden_. Or in the amorous episodes that pervade the corpus of tales of the _Arabian Nights_. Or in the _Book of Exposition in the Science of Coition_, attributed to a certain theologian and historian named Jalal al-Din al-Siyuti. Many Arab erotic treatises actually introduce the subject with a devout invocation to Allah as the creator and dispenser of such beatific and voluptuous pleasures as are detailed in the text.