I've been noticing this fairly often recently.
It seems easier to get into debates/quite in depth discussion about politics or ideas, more conceptual/abstract stuff with men than it does women.
Obviously my female friends are like this, that's why we're friends! I'm talking about casual encounters, random people you meet through events or friends of friends.
At least, it seems more frequent or easier to go down the path of having those more "pondering" discussions with a lot of the men I come across, whereas with women it tends to focus on their families, or past relationships, music, books, clothes, travel etc. More "real life" stuff.
Have you noticed this, and if you have, why is it?