[studioj]

In many species, sexual promiscuity seems to be a virtue. The mixing of genes among multiple partners helps ensure genetic diversity. Yet in humans, sexual promiscuity seems to create the opportunity for many bacterial and viral STDs, some of which are fatal and many of which cause infertility - especially in women. Prior to the modern sexual revolution the number of known STDs was fewer than 10. In the 40 years since the revolution, that number increased by more than 300%. We've become healthier yet less fertile. The observation that, in humans, increased promiscuity increases STDs seems at odds with the idea that genetic diversity should be encouraged in a species for it to remain genetically strong. ie the act of creating genetic diversity through promiscuity seems to create a negative effect on the propagation of the species. What is it, biologically speaking, that predisposes humans to STDs while other species that practice promiscuity don't seem to suffer from these afflictions