Thirdly, The distention of the cells of the vesiculæ seminales, and of the sinuses of the uterus, which take place about the time of puberty, must make these organs more particularly irritable then. It may perhaps be, that the acrimony of the urine and fæces, which make vivid impressions on the neighbouring parts, have also a share in increasing the irritability of the organs of generation.
Fourthly, Young persons hear and read numberless things, in this degenerate and corrupt state of human life, which carry nervous influences of the pleasurable kind (be they vibrations, or any other species of motion) to the organs of generation. This will be better understood, if the reader please to recollect what was delivered above concerning the methods by which we learn to distinguish the sensations of the parts external and internal from each other. For it will be easy to see, that when we are once arrived at this power, the associated circumstances of any sensations, such as the language that relates to them, will recall the ideas of these sensations.
Fifthly, The particular shame, which regards the organs of generation, may, when considered as an associated circumstance, like other pains, be so far diminished as to fall within the limits of pleasure, and add considerably to the sum total.
Sixthly, The sources here pointed out seem sufficient to account for the general desires, which are observable in young persons; and which, when not allowed and indulged, may be considered as within the confines of virtue.
Seventhly, It is usual for these desires, after some time, to fix upon a particular object, on account of the apprehended beauty of the person, or perfection of the mind, also from mutual obligations, or marks of affection, from more frequent intercourses, &c. after which these desires suggest, and are suggested by, the idea of the beloved person, and all its associates, reciprocally and indefinitely, so as in some cases to engross the whole fancy and mind. However, this particular attachment, when under proper restrictions and regulations, is not only within the confines of virtue, but often the parent of the most disinterested, and pure, and exalted kinds of it.
Eighthly, When these desires are gratified, the idea of the beloved person, and its associates, must now be associated with the state of neutrality and indifference, that succeeds after gratification. Whence it appears, that that part of the affection towards the beloved person, which arises from gross animal causes, cannot remain long at its height, and may fall very fast. However, if the other sources of affection grow stronger, the sum total may continue the same, or even increase.
Ninthly, When impure desires are allowed, indulged, and heightened voluntarily, it is evident from the doctrine of association, that they will draw to themselves all the other pleasures of our nature, and even, by adhering to many neutral circumstances,
