In reply to Pero:
The obsessive detail of a guidebook, the nerdiness of the names of climbs, keeping a logbook all bear the male hallmark.
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I'm not sure about this - I'll spend my free time flicking through guidebooks, have been known to choose climbs purely based on their names, and am fairly obsessive with keeping a logbook. I know very few males who do any of these things (infact, my male partner usually leaves crag and route choice to me, as he just isn't really interested in reading guidebooks beforehand and picks his routes more based on the line once we're already there - he climbs slightly harder than me and does an equal amount of leading). I'm certainly not the only girl I know with a guidebook/logbook obsession! Of course, everyone, male or female, is different, whether they just want to get out and climb and focus purely on that, or write everything down too and study guidebooks.
I think of all the climbers I know, roughly half are female, maybe a bit less. This doesn't include any 'indoor only' climbers. Despite this, there's a definite grade imbalance between sexes of climbers I know - certainly more of the guys are regularly climbing higher grades than the girls - although there are exceptions of course.
I've never climbed as an all-female group, but then I rarely climb in a group at all and wouldn't seek it out. My main partner is male, but then he's also my boyfriend. Out of the top 15 partners in my UKC logbook, only one is female. Do I climb differently with girls than guys? Maybe. I think though it's much more dependent on my partner's experience than their gender. With my boyfriend, I tend to be assertive when it comes to route choice and pushing myself a bit, yet tend to rely on him to finish something if I can't (as he is stronger - this could be seen as both good and bad though depending on your viewpoint). With the above mentioned female partner I am less dependent on her to get me out of a sticky situation (we are pretty much an even match in grade/experience) - but possibly lower my objectives slightly because of this. I've had male partners that I am very passive with (as they are harder climbers and more experienced), but also ones where I make all the calls and lead every pitch (as I'm the more experienced climber).