They've had to find the confidence themselves to talk about condoms and learn the hard way.

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Katherine, 17, from Essex, says teenagers do talk about condoms, but nearly always in a joking way.

BBC: Condoms: Why are we still embarrassed about using them?

Since Mr Museveni made a speech strongly attacking condoms last year, say campaigners, primary-school children are no longer taught about condoms, which are no longer prominent in public advertisements.

ECONOMIST: Uganda

Many of the people surveyed said they did not know much about contraception to begin with -- 63 percent said they knew little or nothing about birth control pills, and 30 percent said they had scant knowledge about condoms.

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"Studies find that kids in abstinence-only programs have negative, biased views about whether condoms work, " she says.

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And both Thailand and Cambodia, long among the activists' favourite examples of how to get things right (don't be squeamish about handing out condoms, particularly to prostitutes, is an important part of the message), continue to do well.

ECONOMIST: AIDS

They were also given condoms and advice about sexually transmitted diseases, and tested for HIV once a month.

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Under a four-year study, one third of the women will be given the gel, one third a placebo and one third will not receive any, while all will be given condoms and taught about their use.

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It's also important for those who are sexually active to talk openly and honestly with partners about STIs, and to use condoms consistently and correctly.

CNN: How sexually active young people can stay safe