Hi Schraf. Since you're interested in this you might be interested in the results of a little googling I did a while back.
While attempting to provide cast iron evidence of the culpability of Roman Catholic penpushers in the spread of HIV I came across their claim that using condoms increased the risk of contracting the virus. Disgusted, I followed various links to try to get to the bottom of this and discovered that, in certain circumstances, they were right. The following is from a WHO report
Although Nonoxynol-9 has been shown to increase the risk of HIV infection when used frequently by women at high risk of infection, it remains a contraceptive option for women at low risk.
This is one of the key findings of a report found at
404
A little more digging uncovered the fact that nonoxynol-9 damages the epithelial lining of the vagina and its thought that this increases the chances of the virus gaining entry. There is a study somewhere (which I can't find again at the moment, but I'll keep looking) that indicated that HIV transmission rates were higher when condoms contained N-9.
In no way am I saying that I find the Vatican line on the banning of condoms right, in fact I would say they were dead wrong, but I thought you might be interested in this little snippet.
Yes, Admin, it's off topic, but I gave up on that a while back