The Yaoi Strain of the Pervert Virus, makes infected males handsome, and homosexual. Also infected women become handsome, homosexual males. Other changes include giving infected near immortality, and/or in some cases the ability to become pregnant. It also rewrites reality, so as to insure that life continues without worry or problem (it is a multi-dimensional virus, after all).
This virus also affects worlds in different ways. Sometimes it shall age individuals whom are under a certain age, or de-age those over a certain age, sometimes it will leave them the same age. It may also make some people, and/or animals anthros (furries) or make animals as smart as humans. Sometimes it will only affect humans, other times it shall affect both humans and animals.
It might even change how biology and reality work, allowing things such as hyper cocks, impaling people on a dick, and other things. Beyond what is common for all strains and what was stated in the first paragraph, anything goes.