The Nancy Padian study is the gold standard for heterosexual HIV. It came out in 1989 and has since been blasted from here to Kingdom Come mostly by stupid and crazy gays. They have been beating her to death for “underestimating the risk of heterosexual HIV.” This is a big deal for the gays because the gays, like the religious right, have long sought to portray HIV as a disease that straights are very much at risk of getting. You know, Mr. and Mrs. Jones next door can get it from doing it missionary style.
The reason they do this is very sleazy, cynical, pure politics. Gays think that if HIV is seen as a “gay men’s disease,” which it is at least as far as males are concerned, then most straight people will not want to spend much money on cures, treatments, vaccines, prophylactics, etc. that does not effect them.
So the political gay lunatics have been beating poor Ms. Padian over the head endlessly in a modern day version of a Salem Witch Trial. She was forced to do a number of mea culpas where she lied and said that her study very much underestimates the risk of heterosexual HIV, and she apologizes very, very much to the poor wronged Identity Politics gay nuts. Thing is her apologies were all a big lie. She did this to cave in to PC mandarins who probably threatened to ruin her career unless she told these lies they demanded she tell. Padian’s figures are as relevant today as they were then.
That study followed serodiscordant HIV couples over five years. I do not believe they used condoms, but I am not sure. 20% of the men seroconverted over a 5 year period in which they probably had sex with their wives perhaps ~700 times. So even if you have sex with an HIV positive woman 700 times over years, you only have a 20% chance of getting HIV. See how hard it is to get?
And even in the cases that did transmit – that 20% – there was a high rate of instances of penile and vaginal bleeding. So you see, if you have sex with an HIV positive woman 700 times over several years, you still have an 80% chance of not getting HIV. And even if you do get it, it looks like vaginal or penile bleeding is involved in many cases.
There is also a theory that heterosexual HIV may need multiple dosings in order to infect. In other words, you may have to receive a dosage infection a number of times, maybe quite a few times, for the disease to transmit. Simply getting one dose may not be enough to transmit. This is almost certainly true in the case of men.
Statistically if a man had sex with a woman who was HIV positive, this is his risk of getting HIV:
700 times = 20% risk 350 times = 10% risk 175 times = 5% risk 87 times = 2.5% risk 35 times = 1% risk 3.5 times = .1% risk 1 time = .03% risk
As we can see in this link, The Truth about AIDS and Heterosexual Transmission, a commenter notes that his friend, an infectious disease physician, has treated a number of HIV patients over the years. This doctor said that he has had quite a few men come in over the years who claim to have gotten it from a woman. Subsequent examination of their bodies revealed either needle tracks from recent drug use and/or examination of their anus revealed signs of recent receptive anal sex (How they figure this out, I have no idea). So in almost all cases, the men who said they got it from women either got it from a sharing a needle with a fellow doper or from getting fucked in the ass by another guy.
In the one case in which he found no signs of homosexual anal sex or IV drug abuse, the man had an active case of genital Herpes when he acquired the infection. The doctor felt that the active Herpes infection may have been an adequate vector to transmit the disease from female to male. Studies in Africa imply that active Herpes infection is a risk for HIV transmission.
Another problem is vaginal HIV titers. Titers are the levels of HIV in various parts of the body. HIV titers have to be pretty high otherwise the disease simply will not transmit at all. Saliva titers are ridiculously low, and it is assumed that they cannot possibly transmit. I have looked closely at vaginal titers of HIV, and honestly they are so low that I wonder how they can ever transmit the disease.
HIV is a bloodborne illness.
People keep forgetting that. And it is hard to transmit even compared to other bloodborne illnesses. Hepatitis B is also a bloodborne illness, but it is 50X easier to transmit than HIV.
Receptive anal sex provides a perfect environment for HIV transmission. Anal linings are very fragile, and there is often microscopic bleeding that takes place in the anal lining during anal sex. Semen has a very high level of HIV, and semen can enter the bloodstream directly via small breaks in the anal lining.
The vagina was built to take a pounding by penises on a regular basis, and in addition must stretch out dramatically to do the seemingly impossible delivery of a baby through that tiny hole. The vaginal walls are very thick compared to anal walls. Nevertheless, semen can still get into the bloodstream via the vaginal walls although this is much harder than via anal sex.
The only entry point for the male in heterosexual sex is the urethra, barring cases of penile bleeding. Vaginal titers are so low that one wonders how they can transmit, and these very low titers would have to go through the urethra which has no link to the bloodstream. So anatomically, transmission is going to be pretty difficult female to male.
There was a lot of female to male transmission happening in Thailand among prostitutes a while back. These prostitutes serviced many men a day, and after a while, they were not aroused anymore and they failed to lubricate. So they were basically dry-fucking. This causes vaginal bleeding, and the men were contacting blood in the vagina this way. Presumably this is how the men contracted HIV.
In Africa, many women use vaginal drying techniques because for some bizarre reason, men think it it more pleasurable to have sex with a drier vagina than with a wetter one. Once again, apparently there is quite a bit of vaginal bleeding and the men’s penises are coming into contact with blood once again, presumably causing HIV transmission
There was a famous case of a Black male pornstar named Darren James who went down to Brazil on a porn shoot. He did not have sex with an actual woman. Instead he had sex with a male to female transsexual of some type. He had insertive anal sex with this person, who was infected with HIV, possibly because when they had a more male body, they were living as a homosexual man and caught HIV the usual way that gay men do. I am not sure how relevant the fact that James caught it from a transsexual and not an actual genetic female, but it deserves mention.
It is very much worth noting that while there have been 30-35 HIV cases in the straight porn industry, most were among females who often got it from receptive anal sex with a male star. James is the only one who caught HIV from sex with a “woman.”
A smaller number of men in the industry have gotten HIV, but it has been proven that all of these men except for James got HIV either from IV drug use needle sharing or via engaging in receptive anal sex. Quite a few straight male pornstars also act in the gay porn industry because it pays better. A significant number also work as gay prostitutes, often as escorts. They do this again because the only real way a man can make money as a prostitute is by serving men as there is hardly any market for gigolos or male prostitutes for women.
In all cases but one in the porn industry, the men got it from receptive anal sex with other men or from sharing needles and then gave it to women during filming, often by having insertive anal sex with the women.
Insertive anal sex with a female may be more risky as the penis may come in contact with a small amount of blood via microscopic bleeding in the anal wall of the receptive partner.
The bottom line to all of this is that it in general seems quite hard for a man to get HIV from a woman.