for more information, try entries liek the following in a search engine:

Aids dry sex

or

hot, tight and dry

go to WHO.org and search that site

try to find peer-reviewed scientific articles in reputable journals

some links I found after a very quick search:

http://www.hrw.org/reports/2003/africa1203/6.htm

http://www.cirp.org/library/disease/HIV/sandala1/

http://www.avert.org/aids-africa-questions-1.htm

http://www.who.int/mediacentre/factsheets/fs247/en/

http://www.rho.org/html/hthps-b-02.html

http://www.alertnet.org/thefacts/reliefresources/aidsfeature.htm