Wow, I haven’t checked this board all weekend because I was engrossed with Star Wars: Knights of the Old Republic and unfortunately forgot about time and space for a while, but now I am even more confused. Ok, let’s try to do this right (hopefully, and I’m not trying to be snarky, here, just want to make sure I get my point across properly).
KoalaBear:
Anal sex is riskier, and the facts you cited prove it. However, for further edification, look further up the paragraph you got those numbers from. More numbers that prove it. Just to make sure, here are the cites for those numbers, and some other cites to add to it:
**DeGruttola V, Seage GR III, Mayer KH, Horsburgh CR. Infectiousness of HIV between male homosexual partners. J Clin Epidemiol 1989; 42(9): 849-856.
Jacquez JA, Koopman JS Simon CP, Longini IM Jr. Role of the primary infection in epidemics of HIV infection in gay cohorts. J Acquir Immun Deific Syndr 1994; 7(11):1169-1184.
Mastro TD, de Vincenzi I. Probabilities of sexual HIV-1 transmission. AIDS 1996; 10(Suppl A):S75-S82.
Vittinghoff E, Douglas J, Judson F, McKirnan D, MacQueen K, Buchbinder SP. *Per-contact risk of human immunodeficiency virus transmission between male sexual partners[/]. Am J Epidemiol 1999; 150(3):306-11.
Royce RA, Sena A, Cates W Jr, Cohen MS. * Sexual transmission of HIV*.
N Engl J Med. 1997 Apr 10;336(15):1072-8.
Younai FS. * Oral HIV transmission*. J Calif Dent Assoc. 2001 Feb;29(2):142-8.**
In the references section for each article are literally hundreds of others which I do not have the time to list (but they are easily checked in the reference sections). These articles are available in the journals provided, but you’ll have to get them yourself, because I cannot reprint them here.
As for Africans (sub-Saharan, anyway) and HIV transmission, these articles will hopefully give a better idea of what Malacandra and I meant regarding anal sex there and what I mentioned about STDs facilitating the spread of the disease:
**Leutscher PD, Behets F, Rousset D, Ramarokoto CE, Siddiqi O, Ravaoalimalala EV, Christensen NO, Migliani R. Sexual behavior and sexually transmitted infections in men living in rural Madagascar: implications for HIV transmission. Sex Transm Dis. 2003 Mar;30(3):262-5
Kamali A, Quigley M, Nakiyingi J, Kinsman J, Kengeya-Kayondo J, Gopal R, Ojwiya A, Hughes P, Carpenter LM, Whitworth J. Syndromic management of sexually-transmitted infections and behaviour change interventions on transmission of HIV-1 in rural Uganda: a community randomised trial. Lancet. 2003 Feb 22;361(9358):645-52.
Brody S, Potterat JJ. * Assessing the role of anal intercourse in the epidemiology of AIDS in Africa*. Int J STD AIDS. 2003 Jul;14(7):431-6.
Halperin DT. Heterosexual anal intercourse: prevalence, cultural factors, and HIV infection and other health risks, Part I. AIDS Patient Care STDS. 1999 Dec;13(12):717-30.**
Also, check out the Vanguard website for some decent information.
Ok, now for reasons for not wearing condoms, or engaging in unsafe sex. Here are a few studies:
**Tharao E, Massaquoi N, Brown M. The silent voices of the HIV/AIDS epidemic: African and Caribbean women. Can J Infect Dis. 2003;14(Supplement A):58A.
Adam BA, Husbands W, Murray J, Maxwell J. Negotiating safety or slipping out of condoms? Processes whereby gay male couples stop practising protected sex. Can J Infect Dis. 2003;14(Supplement A):58A.
Wiggers LC, de Wit JB, Gras MJ, Coutinho RA, van den Hoek A. Risk behavior and social-cognitive determinants of condom use among ethnic minority communities in Amsterdam. AIDS Educ Prev. 2003 Oct;15(5):430-47.**
3 from the same journal issue:
*Greig FE, Koopman C. * Multilevel analysis of women’s empowerment and HIV prevention: quantitative survey Results from a preliminary study in Botswana. AIDS Behav. 2003 Jun;7(2):195-208.
Sterk CE, Klein H, Elifson KW. * Perceived condom use self-efficacy among at-risk women*. AIDS Behav. 2003 Jun;7(2):175-82.
Salabarria-Pena Y, Lee JW, Montgomery SB, Hopp HW, Muralles AA. * Determinants of female and male condom use among immigrant women of Central American descent*. AIDS Behav. 2003 Jun;7(2):163-74.**
And more:
*Cabral RJ, Posner SF, Macaluso M, Artz LM, Johnson C, Pulley L. * Do main partner conflict, power dynamics, and control over use of male condoms predict subsequent use of the female condom? Women Health. 2003;38(1):37-52.
Wolfe WA. * Overlooked role of African-American males’ hypermasculinity in the epidemic of unintended pregnancies and HIV/AIDS cases with young African-American women*. J Natl Med Assoc. 2003 Sep;95(9):846-52.
Norman LR. * Predictors of consistent condom use: a hierarchical analysis of adults from Kenya, Tanzania and Trinidad*. Int J STD AIDS. 2003 Sep;14(9):584-90.**
These are just recent studies from 2003 that I’ve looked at, there are hundreds and hundreds more going further back in time.
As for the rectum being a more efficient barrier, well, I’ll call your bluff and use the same tactic on you as you have on me: prove it. Every instance of transmission research I’ve read has put anal sex as riskier, because the rectum is less suited for penetration, has fewer natural mucosae to protect it, and tears more easily, resulting in blood leakage (the best route for HIV to get inside the body). So show me the proof of your suspicion.
Now, as for comparing the vaginal and anal percentages: the vaginal percentage given in the paragraph pertains to both insertive and receptive vaginal intercourse. The phrasing “penile-vaginal” in the paragraph of the Epi Update is meant to indicate contact between the two. The probability given came from an analysis of several other studies by Mastro et al (cited above). So my assertion stands, that even averaging anal insertive and receptive intercourse leaves a higher risk rate than vaginal insertive and receptive. That said, Mastro list some studies with just receptive vaginal, and the probabilities range from 0.0005 to 0.002, still lower than receptive anal.
Ok. As for me mentioning that I wrote most of the Update, it was more in a “Wow, someone actually read that outside of the small group of researchers who are interested in this sort of thing, and that’s cool because it means our work is not totally ignored” context, and so a small little boost for me. I was not trying to brag, or sound officious, and if I did, my apologies.
I will address your further point to Malacandra, by simply saying that of course you can’t get HIV from someone who doesn’t have it, no one is disputing that. The point he (I assume) and I were trying to make is that not having total knowledge of your partner’s history (which, let’s be frank, isn’t always available) means that there is a chance someone can have it. From a prevention point of view, this means that if you want people to minimize their risk, you need to tell them what behaviours are risky and of those, which are the riskiest. You can call it homophobia, or whatever, but the truth hurts, sometimes, and it would be a disservice to people to ignore the evidence.
Also, there are a substantial number of people who have the virus but are unaware. Check out those same Epi Updates you first looked at for more info on the estimates (I didn’t write that one). Even if you think you’re clean (not you specifically, anyone), there is a chance, so better to be safe than sorry, and get tested.
So if this helps, I’m glad. If not, then I do not know what I can say or do to show you.