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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.
Research early on in the epidemic showed that 40 to 70% of men who claimed they use condoms 100% of the time in fact did not use them for every act of intercourse.
Twenty years later, 51 to 66% of women taking part in a microbicide study reported 100% condom usage at different time points during the trial, but the researchers calculated from inconsistency in their answers that the actual proportion who maintained 100% condom use was 25%.
To tell men NOT to feel this way would be akin to telling them not to breathe.
Now, I don’t always agree with all of the conclusions that Rudder draws from his Ok Cupid data.
consistently; its effectiveness is how well it actually works to prevent disease or infection in a given population, given actual levels of use.
In one of the most highly publicised statements, in October 2003, the President of the Vatican's Pontifical Council for the Family, Cardinal Alfonso Lopez Trujillo, said: "The AIDS virus is roughly 450 times smaller than the spermatozoon.
The spermatozoon can easily pass through the 'net' that is formed by the condom.
Women were much less likely to report inconsistent use of condoms than never using them: over the course of the study, 46% of women said they used condoms ‘always’, 48% ’never’ and only 6% ’sometimes’.
For the reasons described above, there is a convention to use two different words when describing the effect of prevention interventions.
Of course, when you flip the data around and look at what age men find women most physically appealing, you get an appalling answer. It’s shocking to see on paper, but not so surprising if you’ve ever talked to an actual man, read a men’s magazine or looked at porn intended for men.