Yeah, the incidence of HIV among intravenous drug uses/needle sharers is pretty compelling. To be infected, the virus must be introduced into your bloodstream - - - so a contaminated needle injected into your body is a lot more dangerous than sex.
Still not sure about health "experts" claims that a mosquito can't transmit, even if it bites the HIV+ person next to you then immediately bites you. . . . . . they always sight body temp, the virus dieing on exposure to air & lower temps . . . . . but since mosquitoes transmit so many other diseases, I'm not convinced.
Don't know what a big-city rave is like - - - - one at a gay club, etc. In my little town, peeps aren't passing needles around !!