"Dry, abrasive vaginas are seen as desirable in sexual intercourse in the vast majority of southern African cultures,"
"Dry sex promulgates HIV/AIDS in three ways: The lack of lubricant results in lacerations in the delicate membrane tissue, making it easier for the lethal virus to enter. In addition, the natural antiseptic lactobacilli that vaginal moisture contains aren't available to combat sexually transmitted diseases. Finally, condoms break far more easily due to the increased friction."
So basically, If you were too lazy to read the article, In Sub-Saharan Africa, the feeling of getting tiny lacerations on your genitals and increased probability of contracting STDs is regarded as the pinnacle of sexual pleasure -- to the point where women induce the state of dryness artificially by sticking irritative leaves in their vaginas. Hot.