If you are interested in contributing to HIV research, and in particular in research looking at new prevention options for people who have receptive anal sex, there's a short-term offer from AmfAR (the American Foundation for AIDS Research) you should know about. AmfAR will match dollar-for-dollar any contribution made to its current fundraising appeal that involves a trek through the Namibian desert (trekkers cover all their own personal costs).

If you sponsor Rowena Johnson, and cite the Rectal Microbicides Working Group (or IRMWG for short) as your organisational affiliation, your contribution plus a matched amount from AmfAR will be earmarked for rectal research. (Please note amounts are in US dollars, and no amount is too small!). Got to www.irmwg.org and click on the link to donate.Dollar-matched offer ends May 20.