I fail to see how the concept of sexual orientation "is so simplistic that it is useless in any practical situation". Okay, so you are straight and I'm gay. I

I fail to see how the concept of sexual orientation "is so simplistic that it is useless in any practical situation". Okay, so you are straight and I'm gay. I can give you a very practical situation: I want to meet someone to have a relationship or just some casual sex with. So I go to a gay bar. Okay, not everyone there will be to my taste, some won't be attractive to me, others won't find me attractive. But we're all on the same page about the wanting-to-have-sex-with-other-dudes thing (except, of course, the straight dudes who go to gay bars to seduce the women who go to gay bars because they aren't filled with douchebags, except they now are because word got out... oh god, kill me now). Without that shared property, any potential sexual or romantic endeavour would be rather fruitless. That's a fairly practical situation which a shared concept of sexual orientation rather helps with. Hell, if someone made an app that led you voluntarily share your sexual orientation via Google Glass so that others could see you marked as straight or gay or bi... killer app right there. ;)