Chung Lau is spending a lot of time on the road these days, mainly explaining to other Aids workers how to get the safer sex message out to the largely hidden groups of men who have sex with men (MSM) in cities throughout the mainland. 'Many [Aids workers] don't have the technical skills, and while they may be enthusiastic about doing something for HIV prevention, a lot of it is trial and error,' Mr Chung says. He teaches workers how to set up outreach programmes similar to those put in place in Hong Kong by Aids Concern, which sends its workers into male saunas, bars, pick-up areas and on to the internet. 'Sure, we can distribute condoms and lubricant, and hand out pamphlets, but the most important work is changing sexual behaviour and getting the authorities to give us some space in which to work.' It's not uncommon for Aids volunteers to be arrested when they go to bars to do promotional work, Mr Chung says. Certain saunas in Hong Kong are extremely reluctant to make condoms available, for fear the police will use them as evidence that sex was taking place on the premises. Also, sex workers worry that police will use the fact that they are carrying condoms as evidence they're breaking the law. 'China's gay community is not as invisible as before, even though they are encountering a lot of difficulties, like police harassment and discrimination,' Mr Chung says. He says local health departments, encouraged by the central government raising the profile of Aids prevention, are now making contact with gay groups in many cities to co-ordinate efforts. Mr Chung has worked with groups in Beijing, Nanjing and Kunming, and has helped Aids Concern build an extensive support network. The Aids Concern model is also being looked at by groups in Sri Lanka, Thailand and Cambodia. Aids Trust funding requirements restrict Aids Concern's direct activities to within Hong Kong. However, one mainland agency is seeking funding to send Aids workers over for training by Aids Concern.