Pope Benedict is still not doing enough in the fight against Aids

Jon O'Brien: You told us: It is irresponsible for the Catholic hierarchy to continue to downplay the role condoms play in preventing the spread of HIV

HIV/Aids: We are all unprotected

Sarah Boseley: On World Aids Day, the Global Fund is collapsing. No fund means millions more in sub-Saharan Africa and beyond at risk

World Aids Day live chat: post your questions for our experts

Thirty years after the first cases of what would later become known as Aids were identified, a drop in funding threatens to undo the work to prevent and treat HIV infections around the world. Discuss the issues with our panel

Change rules on drugs for HIV, says top doctor

Chair of British HIV Association says law stopping visitors to UK and asylum seekers from getting drugs must be changed

Genital warts vaccination to be offered to schoolgirls

Doctors welcome news and predict that genital warts could be eradicated among heterosexuals within 20 years

The pope is still sidestepping the issue of contraception and Aids

Anna Clark: It is remarkable that the pope persists in prescribing a response to Aids in Africa that makes no mention of contraception

Battling HIV prejudice with Body & Soul

It's estimated 100,000 people are living with Aids and HIV in Britain, many of them young people who face prejudice on a daily basis. But a series of celebrity portraits by Rankin and a powerful new film called Life in My Shoes are challenging that stigma

Experience: my boyfriend went to prison for infecting me with HIV

Diane Reeve: 'After we broke up, I went for a routine medical checkup. I was told I had a sexually transmitted disease'

Female orgasm captured in series of brain scans

The animation will help scientists understand how the female brain conducts the symphony of activity that leads to an orgasm

America’s problem with sex education

Daniel Denvir: Given the comic failure of abstinence-only – 95% of Americans have premarital sex – isn't it time the US got over its hangup?

The world is home to 7 billion people, but how far have we come?

Babatunde Osotimehin: The population milestone is a reminder that there is much work to do on sexual and reproductive health and HIV if we are to meet the millennium development goals by 2015

Zanzibar’s Islamic scholars tackle sex, contraception, and HIV and Aids

Damian Carrington: Religious leaders are behind a shift in attitudes that could reduce HIV infection, improve maternal health and curb population growth