rd2 -- trust me, even being married is no guarantee of insurance rights. we cannot afford to have me on my wife's insurance, and her employer is a pretty well-off county municipality.
the insurance she has is total crap first off, but then the rates are insane. her copay is $50 per dr. visit, $40 per prescription -- for generics!
but check out the premiums:
for one person: $70/mo
for one FAMILY (meaning 1 parent and children): $110/mo
for ONE COUPLE: $470 PER MONTH
outrageous. i have no insurance; it's cheaper to pay out of pocket than to have it!
anyway, there is a HUGE misunderstanding that gay men want to get their "AIDS-ridden partners" on their health insurance. first off, that's not even remotely why gays want the right to marry by far, secondly, even IF such hordes of AIDS-ridden gay men existed (btw, the lowest transmission rate is among lesbians; the fastest growing rate in non-white HETERO women), pre-existing condition clauses wouldn't allow for this.
the "where to draw the line" question is not as dynamic as some would have it, though. i do understand your concerns, but first off, less than 10% of people are gay. of that 10%, nowhere NEAR every one of them wants to marry. but there is a huge hue and cry to allow same-sex marriage because this IS a population who has been fighting for this for decades. there are NOT similar numbers of people in the other hypothetical situations who have been trying and trying and trying to get the right to legally marry, though. even if there were all these hypothetical people wanting this, there are not the sheer numbers, and there is not the demand. look at how many gay folks have gone to court for the right to marry -- then look for court cases of these other hypotheticals. they're just not there.
it makes no sense to withold marriage from a group of people who have been asking for it for decades just because of the fear that some other group of people MIGHT ask for the same -- especially when there's no evidence that such other groups exist or have been seeking the right to marriage if they do.
the same problem, though, exists if you think of bush's advocacy and push of people to marry. say a bunch of heterosexuals all clamor for the altar -- that too would jack up the number of people eligible for health care -- again, assuming they would be a) really eligible (no pre-conditions), b) able to afford the premiums and c) don't already have their own individual plans -- many folks of all orientations have their own health plans through their own jobs and do not use their partners' plans. 🙂