When Sandra Day O'Connor retired from the Supreme Court, the primary reason was that her husband was suffering from mental decline and was in a care facility - where he had struck up a sexual relationship with another resident who was also suffering from senility, for lack of a better word. An article I read around that time, in Slate I believe, said that such a thing was not all that uncommon among institutionalized old people. The article went through all the moral, legal, and ethical issues of such people who do not recognize their decades-long spouses, but are having a torrid affair with new acquaintance. Some try to stop it, some say let them live their last years having this fun. Overall, though it was sad, it reinforced how strong our sexual needs are. I commend Justice O'Connor for responding with love instead of anger or drama.
I don't look forward to getting old, but I do look forward to continuing to having sex, straight and Lesbian.