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fredag 20 mars 2009

The pope: condoms don't help against HIV

It is perhaps old news that the Catholic Church is not a fan of condoms; however, they are rarely as blunt about it as the other day. Pope Benedictines, a man who seems to be dreaming of past times (medieval times), has now publicly announced that condoms is not the way to go if you want to stop HIV. Indeed, the pope is even claiming that condoms make the problem worse because people have more sex.


What evidence does he have for this claim? None, of course, the Catholic Church does not seem to know what evidence means. Their method for finding the truth is asking the pope and whatever he says is the truth, never mind that there are numerous studies showing that the pope is simply wrong in his statement.


Rarely does the distinction between the scientific method and the catholic (or religious) way become so clear. Do you want to trust what the pope says just because he is the pope, or do you want to trust people who have actually gone out and looked at the effects of condom use? Know that choosing the latter will make you a heretic in the eyes of the Catholic Church. Religion or Science? Irrationality or Rationality? Your choice...

onsdag 6 februari 2008

New circumcision study

I have previously written quite a lot about circumcision. See for example (1) here, (2) here, or (3) here. Circumcision proponents use different arguments when they try to spread this surgical procedure. Sometimes they say that your hygiene benefits, which may be true if you never ever clean yourself under the foreskin - hardly a reason for removing the foreskin. Another rather medievil argument is that circumcision will make it harder for the child to masturbate, and after all sexual pleasure is something you should avoid!


The only potentially valid argument for the use of circumcision, an argument which has only been around for perhaps five years (before that circumcision was conducted for irrational reasons entirely), is that it may reduce the risk of getting HIV if you have unprotected sex. Based on this some people argue that we should use mass circumcision to prevent the spread of HIV. There are many arguements against this.

First of all, people normally don't make their sexual debut when they are still in diapers, so let them choose themselves whether they wan't to be circumcised when they have reached an age where they can actually make such decisions. Secondly, condoms work much better than having your penis circumcised, so why not spend all the money advocating the use of condoms and handing them out for free instead? Furthermore, people who have been circumcised may feel safer and therefore have more unprotected sex, thus cancelling the potential gain...

Another serious argument against circumcision is that circumcision may cause serious problems for the patient in terms of penile function and penile sensitivity. The foreskin has a lot of sensory nerve endings. According to estimates that I have read, 50% of the nerve endings in the penis are in the foreskin. Just recently a study investigating the consequences of circumcision came out.

The study seems to show that people who have been circumcised do not suffer from reduced pleasure, at least that is what they say. However, as Mary Crewe points out, studies like these do not take into account psychological biases which are very likely to be at work. If you go and have yourself circumcised (the people in the study voluntered of course), then you will want to justify that decisions afterwards. As a result, minor troubles are likely not to be reported. The patient will simply bite together and say "I am fine, and my sex life is great".

For this reason I think it would be a mistake to start circumcising people based on this type of questionnaire evidence. Some sort of medical examination of penile function (or dysfunction) would be preferred.

fredag 10 november 2006

Why we need the theory of evolution to explain HIV


If you are wondering why the HIV virus unlike other viruses kills you and if you have not accepted the catholic explanation that all Africans who get aids are sinners and deserved it you might want to continue reading.

The reason that our otherwise extremely impressive immune system is not able to cope with the HIV virus in the long run, is that the virus has a very high mutation and proliferation rate. Following any type of virus infection, the number of viruses in your body will go up exponentially, however, once your immune system is able to recognize the virus it will mobilize its troops (the white blood cells) and destroy the invader.

The same thing happens when someone is infected with HIV, first the number of viruses go up, then down. However, because of its rapid mutation rate, some of the HIV viruses will change so much that the immune system no longer recognize the virus. This new virus, which has evolved by natural selection will proliferate. Our immune system will soon be able to recognize the new invader, but then yet a different virus will be present. This constant race will go on for about ten years. At that time the HIV virus will have killed of so many white blood cells (the HIV virus is specifically targeting white blood cells) that the body can no longer defend itself against otherwise non-fatal infection, and you will die, perhaps, from a simple flu.