I don't think anyone would ever describe trials in that way. You're one interesting guy...
It depends on the situation..
If you're in a club dancing, you keep making eye contact with someone, this leads to the odd smile.. It's hard to talk to someone in a crowded place with music etc. Just generally introduce yourself and then ask if the want to grab a drink.. It's better than the 'I CAN'T HEAR YOU!'. If they're attracted they will say yes, 95% of the time it works and if not, meh move on.