Of course, the conversation should be appropriate for the setting. If you're in a noisy bar, the girl you're chatting up might not be in the mood to talk about personal or philosophical subjects. Still, it should be possible to say something meaningful about the music, the crowd, or the feel of the evening that shows her you're enjoying the moment with her.
There's a ridiculous amount of social pressure in North America to have sex, for men to have "more" partners, and for women to detach emotionally and make it "okay." Almost everyone I met in Europe in their mid 20s to 30s had had one, maybe two, very long term partnerships, and perhaps one casual, one night stand. Everyone I know in North America? Um... I've lost count.