The average number of partners for homosexuals (at least for those in the United States and the European Union) witnessed a considerable decline in the late 1980s and 1990s, as the spread of AIDS instilled a fear in them. But the situation reversed in the beginning of the 21st century, as the invention of Anti-retrovirals made AIDS a manageable disease. These people are not afraid of catching AIDS, as it will not kill them. However, the tax payers will suffer quite a lot.
I tripped out when I first heard about these "Bug Chasers" - people who purposely seek-out someone to give them HIV/AIDS:
In the last couple years, the practice of bug chasing has started to spread over social networking and been reported by the media. Some people have even claimed that HIV will give them a better quality of life because of the medication. One individual, Nick, is quoted on Facebook: “Tested positive on 21st September and totally loving it! Wanna share with any chasers, CD4 is 971, VL 100,000 – nice and toxic!”
http://knowledgenuts.com/2013/10/04/the-bug-chasers-who-actually-want-to-get-hivaids/