But this objection is groundless, for the person acting and the person acted upon being of different kinds, there is a reason for the difference in their ways of working; but there is no reason for any difference in the pleasure they feel, because they both naturally derive pleasure from the act they perform.[35]
On this again some may say that when different persons are engaged in doing the same work, we find that they accomplish the same end or purpose: while, on the contrary, in the case of men and women we find that each of them accomplishes his or her own end separately, and this is inconsistent. But this is a mistake, for we find that sometimes two things are done at the same time, as for instance in the fighting of rams, both the rams receive the shock at the same time on their heads. Again, in throwing one wood apple against another, and also in a fight or struggle of wrestlers. If it be said that in these cases the things employed are of the same kind, it is answered that even in the case of men and women, the nature of the two persons is the same. And as the difference in their ways of working arises from the difference of their conformation only, it follows that men experience the same kind of pleasure as women do.
There is also a verse on this subject as follows: "Men and women being of the same nature, feel the same kind of pleasure, and therefore a man should marry such a woman as will love him ever afterwards."
The pleasure of men and women being thus proved to be of the same kind, it follows that in regard to time, there are nine kinds of sexual intercourse, in the same way as there are nine kinds, according to the force of passion.
There being thus nine kinds of union with regard to dimensions, force of passion, and time, respectively, by making combinations of them, innumerable kinds of union would be produced. Therefore in each particular kind of sexual union, men should use such means as they may think suitable for the occasion.[36]
At the first time of sexual union the passion of the male is intense, and his time is short, but in subsequent unions on the same day the reverse of this is the case. With the female, however, it is the contrary, for at the first time her passion is weak, and then her time long, but on subsequent occasions on the same day, her passion is intense and her time short, until her passion is satisfied.