As we humans age, our frequency of sexual activity slackens off. After a certain point it becomes increasingly physically difficult.
Bonobos are highly sexual, and use and trade sex for most everything. It seems to me that an aging bonobo which followed that human trend would begin to lose out in chimp society. I’m betting they screw - like monkeys- right up until death.
I’m asking about chimps because they have few predators, and of the large mammals, they are sexual outside of reproductive urges.
My ultimate curiosity is whether as humans we lose it cause we dont use it, if you know know what I mean.