Of the sexual transfer mechanisms, the highest probability of transfer is clearly that of unprotected anal sex. Anal sex between an HIV positive male and an uninfected partner, either female or male, can result in transmission of the virus once in every three to ten sexual acts (1/3 to 1/10). That rests in sharp contrast to the probability of transfer through unprotected vaginal sex from an HIV positive male to an uninfected female (1/75 to 1/300), or the opposite transmission from an HIV positive female to an uninfected male through unprotected vaginal sex (1/300 to (1/1000).
Oral sex is also a mechanism of transmission, but the small number of verified cases of such transmission, and the fact that oral sex is often accompanied by other forms of sexual activity, make it difficult to estimate a probability. There do exist verified cases of oral sex transmission, both heterosexual and homosexual; the probability is low, but quite real. A recent report indicates that persons with allergies, asthma, eczema, and allergic meningitis are more susceptible to orogenital transfer, presumably because of the excess of lymphocytes responding to allergy-induced inflammations in the mouth and throat.
Anal sex is a more likely mechanism of transmission than vaginal sex, primarily because that part of the body, unlike the vagina, is not evolutionary adapted for the physical activity of sexual intercourse. Simply put, the lower end of the large intestine (rectum) is a thin-walled tube that breaks easily, bleeds when it breaks, and has a major supply of lymphocytes and macrophages (including the CD4 group) waiting to be infected by HIV.
From the perspective of functional anatomy, unprotected anal intercourse is biologically stupid! It is an open invitation to serious damage of the rectum as well as to the easy transfer of any sexually transmitted disease such as gonorrhea, syphilis, herpes, papilloma and Hepatitis B. Hepatitis B (for which there is a vaccine) is more easily transmitted sexually than HIV, and results in the death of some 20%-25% of those who acquire an infection.
http://www.arcmesa.com/pdf/hivfun0100.pdf
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First, we have to break up the liberal monopoly in mainstream media and disemploy the journopolemicists.
Second, we have to disemploy the liberals in academia, removing tenure from people who do nothing but agitate, and also from anyone who has ever moved to deny tenure to someone else because he disagreed with their views -- which liberals in academia do all the time, and nobody ever calls them on it.
Third, we have to change the composition of the courts and replace the bench legislators and social activists with jurists.
Fourth, we have to get the Log Cabins out of the Republican Party, and displace and disemploy all the GOP pols who let them in -- and that includes, unfortunately, George W. Bush. The DemonRat Party will take the part of the gays reflexively in political affairs. The Republican Party perforce, as the only responsible political party, must defend traditional morality and public sexual hygiene. Therefore, any GOP politician who is unwilling to undertake this duty must go.
Fifth, we have to free the American Psychiatric Association from the undue influence of its gay lobby and get it to disestablish its standing "gay committees in charge of gayness", so that an open discussion of homosexuality as a paraphilia may resume after an interruption of 30 years.
That takes care of the table-tilters.
Then, we can engage the HRC and its lobby and force them to argue their position point-by-point in front of a candid public, unfiltered by their friends, sympathizers, closeted cabalists and back-channel contacts and helpers.
Then we will see what society thinks about homosexuality, and what our policy ought to be with respect to it.
Anyone who thinks the outcomes currently being obtained by the homosexuals for their agenda are the result of a free and open discussion of the truth is out of his tiny little mind. This is a rigged process, and they are doing the rigging. We have to admit that first, and go about cleaning up the game, before we can have an honest discussion about these issues.