As it happens, yes I did mention Bitcoin on a first date. Obviously didn't go into geeky tech details, but just the revolutionary, innovative, somewhat anarchistic aspects of it, how I believe this is gonna change the world just like the Internet did, etc.
Here's my take on it: women generally like emotions (I get all passionate when I talk about Bitcoin), men with vision, men with money, men who believe in something and stand up for it and take initiative. So as long as you avoid a logical, factual, technical conversation, see how Bitcoin actually works great in a dating context?
By the way, this was over a year ago and she's still my girlfriend.
I've considered using a similar approach, the fact bitcoin could take over the world and change it just like internet did and being a pioneer is pretty fascinating to someone that has never heard about it. Let's just hope the price doesn't lag begin so we can say quick "see, i was right", that is an insta pickup, specially when she realizes you are rich now lol.