# Observations on Man (6th edition)/Part I/Chapter II/Section VI
### Section VISection VI

THE DESIRES OF THE SEXES TOWARDS EACH OTHER.
Here we are to observe, first, that when a general pleasurable state is introduced into the body, either by direct impressions, or by associated influences, the organs of generation must sympathize with this general state, for the same reasons as the other parts do. They must therefore be affected with vibrations in their nerves, which rise above indifference into the limits of pleasure from youth, health, grateful aliment, the pleasures of imagination, ambition, and sympathy, or any other cause, which diffuses grateful vibrations over the whole system.
Secondly, As these organs are endued with a greater degree of sensibility than the other parts, from their make, and the peculiar structure and disposition of their nerves, whatever these be, we may expect, that they should be more affected by these general pleasurable states of the nervous system than the other parts.
​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, ​convert them into incentives and temptations. So that all the desires, designs, and ideas of such persons are tainted with lust. However, the diseases and sufferings, bodily and mental, which this vice brings upon men, do, after some time, often check the exorbitancy of it, still in the way of association. But impure desires subsist, like vicious ones of other kinds, long after the pains outweigh the pleasures, inasmuch as they must be supposed not to begin to decline till the pains apprehended to arise from them, and thus associated with them, become equal to the pleasures.
Tenthly, It appears from the course of reasoning here used, that impure and vicious desires, indulged and heightened voluntarily, can by no means consist with a particular attachment and confinement; also that they must not only end frequently in indifference, but even in hatred and abhorrence. For the proper mental sources of affection are not only wanting in these cases, but many displeasing and odious qualities and dispositions of mind must offer themselves to view by degrees.
Eleventhly, As the desires and pleasures of this kind are thus increased by associated influences from other parts of our natures, so they are reflected back by innumerable associated methods, direct and indirect, upon the various incidents and events of life, so as to affect in secondary ways even those who have never experienced the gross corporeal gratification. And, notwithstanding the great and public mischiefs, which arise from the ungovernable desires of the vicious, there is great reason, even from this theory, to apprehend, that if this source of the benevolent affections was cut off, all other circumstances remaining the same, mankind would become much more selfish and malicious, much more wicked and miserable, upon the whole, than they now are.
Twelfthly, I have hitherto chiefly considered how far the present subject is agreeable to the doctrine of association; but if physicians and anatomists will compare the circumstances of the sensations and motions of these organs with the general theory delivered in the first chapter, they may see considerable evidences for sensory vibrations, for their running along membranes, and affecting the neighbouring muscles in a particular manner: they may see also, that muscular contractions, which are nearly automatic at first, become afterwards subject to the influence of ideas.
Thirteenthly, The theory here proposed for explaining the nature and growth of these desires shews in every step, how watchful every person, who desires true chastity and purity of heart, ought to be over his thoughts, his discourses, his studies, and his intercourses with the world in general, and with the other sex in particular. There is no security but in flight, in turning our minds from all the associated circumstances, and begetting a new train of thoughts and desires, by an honest, ​virtuous, religious attention to the duty of the time and place. To which must be added great abstinence in diet, and bodily labour, if required.