This is kind of a sticking point with me because I've had a few really great girl friends, but I've also dated girls that a lot of you guys sem to refer to.
This is my synopsis:
There are two type of women that have mainly guy friends: The Cool Chick and the Snake in the Grass.
The first type: The Cool Chick. For whatever reason, she just gets along with guys better, connects with them more, sometimes due to growing up with brothers for instance. I have a long time friend like this. She's not into the typical chick drama or petty gossip and insecure conversations. She's good looking and all woman, but she loves hanging out with the boys. She laughs and shakes her head at the stories she hears, but she also chimes in with usually good advice. She gets it. She's just more comfortable around guys. And when the bill comes, she pays her way, sometimes more because she's financially successful. She has a few girl friends that she's known for a long time, but it's a lot easier for her to make new guy friends then it is girl friends.
The second type, and everyone's favorite: The Snake in the grass. This chick has a lot of guy friends because, to her, a "friend" is something she uses for her benefit. For her, she quickly realized that guys are a lot easier to manipulate than women. Why go to lunch with a woman while pretending to care about her meaningless life and at the end, having to split the bill, when you can go to lunch with a guy and he'll pay for it, at the same time showering her with attention and letting her be the centerpiece of the conversation. Friendship to her is not a mutual give and take, it's a take. Whatever she gives is a small investment on future greater returns. She has no real loyalty to those around her. She will have girlfriends, but those friendships are usually short lived, and usually just for show.
I was in an LTR with a woman like this^^^^. Orbiters for days. I met up with her and her "best friend", who did happen to be a girl. They seemed to get along fine at the time but I thought it was strange that her "best friend" was asking her questions like: "so where did you grow up?".
There may be a little cross over at times between the two. But those are the two types I've had experience with. They're both chicks, and they both do chick $hit, but as a friend, one's looking out for you, while the other's looking out for only herself.