I agree with stealth that practice is an effective means of getting good at this, however I would not recommend using opinion openers if you really don't care about the answer.
Like honestly how many guys you think actually care about who lies more men or women? It's always better to use something from your life that way it is totally congruent with you.
Quote:
Man, this weather sucks doesn't it?" or "This bar is so noisy it's lame as hell!" or "This club's music is boring, I wish they played better tunes!"
These are interesting. I think they would be even more effective if you lead it in a positive direction. Sometimes people don't want to think about negative things. My experience with opening with something negative is that girls are like whoaaaa I'm out to have fun, don't wanna go there.
Really people place too much value on the opener, no wonder guys get nervous about it. The opener doesn't matter all it does is lead the conversation where you want it to go and cause her to feel friendly towards you. What really matters are the qualities that you like about her that makes her cool enough to be part of your life.
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