Does anyone just go on a date when they are asked just because?
I think this is not quite what you were asking for, but your question made me think of it. After getting some (I think unfair) grief about being too picky, I thought up the brilliant idea of pledging that I would give a first date to anyone who asked. You know, just to prove to them that I was not being unreasonably picky... And that is how I went out on a date with a guy who apparently used most of his English to ask me out. I got some free drinks, some sparkly hair clips, and a hilarious story out of it. I still remember the look on his face when I was miming "Dracula." I was trying to confirm that I had understood him. That's what I thought we were "talking" about... it was right after Halloween, after all, and we had managed to somehow touch on movies. Unfortunately, he was saying "tequila" ...which I figured out when he pointed to it on the menu. Oh, man... the look on his face... me with my mimed fangs and vampire noises and creepy threatening hands... I will never know quite what was going through his head. Needless to say there was no second date.
I have since decided that I am confident in my open-mindedness and self-regulation and don't need to prove anything to anyone anymore.
More to your point, I have previously agreed to share meals and join people on outings in situations I did not consider romantic-type dates. Some go alright, and some end up dates by stealth, which does make one a little reticent to accept future "just lunches," unfortunately. And that works both ways, I suppose. I have a male colleague who is my age, whom I am not interested in, but whom I think would be cool to hang out with as just friends. Unfortunately, perhaps because young/single males in my department are few and far between and often chased after, he keeps himself rather aloof. Too bad.