This couple thing is getting old. If you want to invite one, you have to invite the other or they're busy being together, blah, blah. It seems like everyone is in some state of coupling: married, engaged, domestic partners, exclusively dating, etc. And it's not just confined to the straight world. My socializing circle has just gotten much smaller - fewer playdates with fewer playmates. With everyone coupled up, there are fewer people to talk about, too. One can't talk about who's interested in who, who their Friday date is, as opposed to their Saturday date...in other words, no mess to debrief about because they are all DATING. Or engaged. Or married. Or might as well be married.
Or maybe I'm just bitter.