If you are not physically attracted to each other, you will remain just friends.

It can be tough, but it's possible. I have a few close female friends as well and we get along fine. Feelings may get involved at times (whether if one of the friends fall for the other) but by that time, they only see you as friends.

May be , but i don't think so~

Definitely. A guy always needs female friends for honest, straightforward advice.

male and female can be friends but there is a bearer between them, example as in religious issue, or if both of them are married. they cannot be too close in this case. This is to avoid adultery. females can be best friends,similarly because they share the same interests. but it doesnt mean that they do everything together most of the time. I have a best friend, we are school buddies. I know she is busy with her families but we remains as best friends ever. Best friends should not have any rivalry or jealousy, these are natural things to avoid if you value your friendship with your best friend.