Some do; check out this show of exclusively women bitcoiners:

https://fountain.fm/show/hbMMGqXd91Ui2Qclej3P

As far as what else to talk about, what do you want to know about her? What is there that she wants to know about you? Religion, politics, philosophy, work, hobbies, likes and dislikes, personal history and future goals, science, music, art… people want to be known, and the deeper the relationship they have with anyone, the more important it is to know that person. Sticking to just one topic won’t get you there, even if you already have it in common.