I think you have misunderstood me. I said that the hormones are used for other things, such as growth of bones or other usages in body development. I expect, and indeed I am obviously not as learned as yourself, that even in our old age although the levels of our hormones do change in our lifetimes, even that 90 year old woman must produce hormones. That said, although I agree that the main aim of sex is for procreation, of course it is, there are indeed other secondary purposes for sex such as emotional bonding as I originally said, which as well as the testimonies of other humans, I have observed documentaries seen on the behaviours of animal species. I am not going to provide the links to studies, given that as well as your own lack of evidence in your arguments, I don't consider this debate important enough for me to waste effort finding them.

I agree with Lynn that you appear to be very rigidly focused. Things can have more than one purpose. As we agreed, the main and overwhelming purpose of sex is reproduction, but human kind developed evolutionary techniques in order to aid it's survival. The human species follows the pattern of "have fewer babies, have more people around to protect" rather than the pattern of "have many babies so that at least a few of them survive". In terms of that evolution, a human female would require a male not just to impregnate her, but also to stick around to protect and provide for her and the child. This of course is an adaptation for our particular development of intercourse. I believe it is that certain hormones/chemicals are released through fulfilling intercourse akin to those released during childbirth (it may not be the same hormone but a similar one) which causes a feeling of bonding. It may be that the theoretical 90 year old woman still produces this hormone (Oxytocin?) during intercourse even past her reproductive years.

I believe species of monkeys perform homosexual behaviours amongst group members in order to more closely bond them as a community. To some degree, humans probably do have the same behaviours. At the very least, there are individuals to whom physical contact (usually hugging or perhaps kissing) is vitally important for a bond so actual further sexual acts might be an extension of that.

One would have to consider the psychosocial aspects of sex drive as well. It would vary among individuals, in some women sex drive is related to testosterone level and others respond better to different types of estrogen and progesterone levels. Diet and other environmental factors may be involved as well. One could consider the genetic influence as well. As I stated, I just point out the complexity of the human body and it's response to hormones. There is no simple yes or no answer.