I agree with Mcnuss that most younger kids especially wouldn't even notice. But I also think (not that you asked, of course, but since I'm here anyway...) that in explaining the fact that some people are gay, there's really no need for explicit sexuality stuff to come into it. I certainly haven't discussed any major "facts of life" stuff (although I hate that term, because there are plenty of facts of life we've discussed...just not the sexual ones! but I digress...) with my daughter yet, but she knows that some people, like her, have just one mom, and others, like many of her friends, have a mom and a dad, and some, like some other kids she knows, have two moms, etc. When she gets a bit older than the 2 1/2 she is now, and starts asking how those various family conglomerations came to be, I think I'll be talking about things like some women falling in love with men and others in love with women and things like that. We have a lullaby that does that - "Everything's Possible," by Fred Small - it also notes that some people choose never to pair up, and that some people choose to have children and others don't, etc...
Anyway, just like heterosexual relationships can be noted and discussed with no mention of the sexual element, so can homosexual ones, was all I wanted to say.
- Elizabeth
ps - forgot to add before - mcnuss: that was the funniest story!