Well you should care, there was a time in the 70's and 80's when the blood supply was tainted by AIDS, by this "innocent" behavior.
Many hemophiliacs were the actual innocent victims.
And the definition of insanity is repeating itself as the homosexual "lifestyle" of excessive drug use and multiple sex partners is again in vogue.
Oh that's right it just an "innocent" behavior and they aren't hurting anybody.
Never happened in a libertarians world.