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It would be unethical to mount a randomised trial of condom use because the control group would have to stop using them altogether.
The evidence we have is based on three types of trials, and each has potential weaknesses.
The spermatozoon can easily pass through the 'net' that is formed by the condom.
Consistently used condoms provide significant protection against HIV, pregnancy and sexually transmitted infections (STIs).(See the text of Museveni’s speech.) Museveni later complained of being misunderstood and signed an article in The Lancet saying that condoms formed a valuable part of HIV prevention.Moral questions about condom use are not within the remit of this resource, but questions of fact are, and condoms’ ability to stop HIV is periodically questioned by people opposed to their use on religious or moral grounds.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.For these reasons, HIV transmission within long-term serodiscordant relationships, especially heterosexual ones, may be rarer than it is between casual sex partners.
For the reasons described above, there is a convention to use two different words when describing the effect of prevention interventions.