This sounds like an alarmingly high number, but consider that there are 60 million coupled households in the US, so only 1% of coupled households are homosexual. About what you would expect for under 2% of the population.
You realize that include ANY household with a homosexual present. Thus if a homosexual man or woman lives with their normal mother or father, that household is labled as homosexual.
The reverse is not true.
Just a racist use the one drop rule. The homosexuals use the one homo rule.