I have heard this before about the virus being smaller than sperm to the point of being able to pass through the condom membrane. If you read the instructions carefully on all packs of condoms there is a disclaimer saying that it isn't a completely fool proof method of protecting against HIV infection. There is a tiny risk of pregnancy as well as risk of infection. The risk is still small. When you consider using the vinyl or sheepskin condoms then the risk jumps quite a bit. I just say - KNOW the person you are sleeping with. Or at the very least make sure you use the condom.
This hogwash about telling an HIV infected man to not use a condom with his wife. That is crap. Even if it didn't work what would be the harm in attempting to protect her? He's married to her for goodness sake. You think he's not going to want to enjoy sex with her.
There is an interesting book on the subject of Aids from the perspective of a family who has been infected by it. The Woman got it first from a blood transfusiong back before they had better methods of testing for Aids. She gave it to her child through breastfeeding and then her husband contracted it as well. They are Christian Protestants and so there is an interesting slant on it. It would be worth reading to at least get another perspective on HIV infection. I have met and spoken to the author. His wife was too ill to attend the conference at the time. This was where I first heard of the idea that the virus can actually get through the condom membrane. The book is titled "When AIDS Comes Home"
http://www.aegis.com/pubs/books/1998/BK980786.html
Hope this helps a little.
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"Always learn the rules so that you can break them properly." Dalai Lama
My Karma just ran over your Dogma.