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Consistently used condoms provide significant protection against HIV, pregnancy and sexually transmitted infections (STIs).
The degree of protection they offer against HIV and STIs is significantly better than any other single prevention method, taken in isolation, other than sexual abstinence or complete mutual monogamy between two people who have tested negative for HIV.
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However, because they are not always used correctly even if they are used consistently, studies have found efficacy rates of 85 to 87% when young women use condoms as their sole form of contraception.
Condoms are, however, the only method on that list that has been shown to protect against STIs as well as pregnancy.
For these reasons, HIV transmission within long-term serodiscordant relationships, especially heterosexual ones, may be rarer than it is between casual sex partners.
For all these reasons, large studies may be needed to establish differences in HIV (and HSV and HPV) incidence between condom users and non-users.
These can be done in individuals whose characteristics are known and can be controlled for, and if the relationship truly is monogamous then infections by acute STIs and from outsiders can be ruled out.
One disadvantage is that condom use in long-term relationships, even in serodiscordant couples, is relatively rare.
In these circumstances, it is easy to see why condoms sometimes fail, even in consistent users.
In addition, however, people are not consistent in their use of condoms, and may not even be consistent when they claim to be, or think they are.
Another is that the HIV-positive partner will be chronically infected and so will not have the very high viral load characteristic of acute HIV infection.
Thirdly, in long-term serodiscordant relationships, studies have shown that the HIV-negative partner can acquire a degree of immunity to their partner’s HIV.
Another kind of study is to conduct a prospective cohort study, looking at differences in HIV incidence between two groups of people according to their usage of condoms.Tags: Adult Dating, affair dating, sex dating