In regard to the "SO" thing, I like the title. A little under a year ago my SO and I became common law partners, not by any choice of ours, but because the Manitoba government changed the laws (during the whole legalization of gay marriages process here in Canada) so that any couple having lived romantically together for two or more years are now considered each other's spouses. While I still consider him my boyfriend (there was no ring or ceremony, hello!) the government considers him my husband. So in all documentation his is, very significantly my other... As tax payers, on the census, etc. we are married. Also, after four years together, I suppose our relationship is more significant than just... dating... I mean, we own a house together, and if there was ( god forbid) a separation, there would be a very serious custody battle over the cats. I used to use the term "partner" but since I actually do have business partners, if I refer to him as my partner, at least in coversation, some people get confused and think I'm referring to a co-worker. On top of all that I work with a lot of people who have same sex partners, who they all referr to as "partners" also, and the lingo, at least in my workplace seems to be applied to same sex couplings only. I like the term "significant other" a lot. It makes it clear that I am in a romantic partnership with someone, without making it juvenile - aka "boyfriend" or clinical of vague - aka "partner." It works. Also, when it comes to my many queer colleagues, when I say I have a "significant other," I can tell that it sets them at ease - this lingo let's them know that I am open to, accepting of, and in deed a part of a non-traditional partnering.