In this section, we will discuss females in friendship - because no matter what some guys say, it is very much possible for guys to have female friends. Granted, these female friends tend to be your girlfriend's (or wife's) friend, or the girlfriend (or wife) of your male best friend, or even an ex-girlfriend who already has someone else. The point is, just because you're of different genders and aren't related (or attracted to each other) doesn't mean that you can't get along famously. We are way past the age where men and women (or boys and girls for that matter) are expected not to mingle because it is "inappropriate". That being said, female friends consist of just that, friends of your who just happen to be female, but are part of that group that you just love hanging out with.
The thing about females in friendships with men is that sometimes they take offense in the fact that their guy friends occasionally slip and forget that they are, in fact, talking to women. Obviously, the only serious rule when it comes to dealing with females in friendship is "DO NOT, UNDER ANY CIRCUMSTANCE, FORGET THAT YOUR FRIEND IS A WOMAN." That's about it. The specifics, however, are to be discussed a little more thoroughly under this section.