'New' WHO guidelines for key populations have been published. Download them now.

http://apps.who.int/iris/bitstream/10665/128048/1/9789241507431_eng.pdf?ua=1&ua=1

Most of the guidance has already been presented in various other publications. This publication consolidates the guidance and puts it in a new confusing format.

But, I think that pre-exposure prophylaxis or prep for men who have sex with men is ill considered. Just because something can be done does not mean it should be done. Pre-exposure prophylaxis for gonorrhea, chlamydia, and syphilis has been available for over fifty years, and these infections are much more infections, but it has never been studied. Because it is a bad idea from the start.

Read one of the best science writers on it: http://www.vox.com/2014/7/14/5896887/explainer-about-the-pill-to-prevent-hiv-aids-Truvada

Or this: http://ethxblog.blogspot.com/2014/07/grinding-my-gears-truvada-marketing.html

Jamie