Time for another book-sized essay ^^
Okay, first of all, the "Guide"
There are no male/female categories because any tag that is applicable to 50% or more comics is automatically (by the new DB) unreferenable. Something more specific is required. The problem is that many comics do not focus on just one character, nor do they focus on just one character that is male or female.
Now more specificly, is when you talk about "gender" or "sex", with the former being what they think they are, and the latter being what they physically look like.
You can have a very masculine male hero character, or you can have a sissy-boy lead character, or you can have a super-sexy female lead, or a blonde-bimbo female, or a brainiac-nerdy looking character that is rather androgenous. It's very hard to just make a binary 'male' or 'female' catch-all when nobody in real life actually a supermale or superfemale embodiment of their physical sex.
Now... Differences between males and females. (Not all apply)
Physically:
Face -
Masculinity is defined with a square jaw, brow-ridge, thick eyebrows, bigger teeth, and the hairline (which is hard to describe) but their forehead looks bigger because their eyebrows and hairline are father apart than feminine ones.
Femininity is defiend with a smaller rounder jaw, no brow ridge, thin eyebrows, smaller teeth and a smaller forehead. The hairline and eyebrows are actually closer together than masculine ones.
Physical body - Other than the obvious "Girls have breasts, Guys have a Penis" quote which isn't even entirely correct, Males usually have broader shoulders and are "straight" instead of curvy. Females are curvy.
Now to throw a few monkey wrenches in...
Straight Females are attracted to males who are about 8% feminine when they are at their "peak" of their cycle (when their body wants to produce a baby), but are attracted to males that are 20% feminine when they are off that part of the cycle. Also, a male can make up for 'unattractiveness' with status or wealth. The same can not be said for females, as males are not attracted to 'unattractive' females, no matter what their status or wealth is.
(This is all from stuff I read in the last 7 days or so.)
Also, the road runs both ways, A male (even straight ones) might find a very feminine male 'cute'. (That was also from the same article.) It's a rare occurance however.
Now from a psychological point of view...
Let's say we have two scales, one that is "masculinity" and "femininity" and they go between 0 and 10, with 10 being "strong" and 0 being "practically non-existant"
Someone who is a 10 on the femininity scale, being physically female might come off as the "feminist" type, if they are between 6 and 9 they would be "typical".
Someone who is a 10 on the masculinity scale, being physically male might come off as the "machoman" which would probably have a male-superiority complex or is very sexist. A 6 to 9 would be "typical".
Now what happens if someone is physically female and has high numbers in both categories? They might turn out to be the butch-dyke type of character, but if they are male, they might turn out to be closeted gay male.
Now if someone who is physically one sex but their masculinity and feminity scales are skewed in favor of the other gender. Ex A female with maybe an 8 on the masculinity scale, but a 3 on the femininity scale would probably want to be a male, and try to act like one (Tomboys.) A male with maybe an 8 on the feminity scale and a 3 on the masculinity scale might be emotional and depressed because they really believe they should be female, but because they are physically male they have to put on an 'act' for their families and schoolmates as to not draw attention to that aspect. Both of these would classify as "Gender Dsyphoric" and I'll let you look that up if you want to know more.
So what have I missed? Sexuality.
Everyone can be put in to one of four categories, except when they are "transgendered"
Heterosexuality - The character is attracted to the Opposite physical sex (male/female pairing)
Homosexuality - The character is attracted to the same physical sex (male/male and female/female)
Bisexuality - The character is attracted to both physical sexes.
Asexual - The character is not attracted to either sex, or has no sex drive.
If the character has a gender identity disorder they might not consider themselves heterosexual or homosexual since they identify as the opposite gender to begin with.
If you are doing a G-rated comic, by all means avoid the topic of sexuality, or fear the wrath of uptight religious crazies everywhere ^^
Now there is something I've missed completely... intersex conditions.
To simplify it down, people can be born 'kinda inbetween'.
So we all do know that people are born either XX or XY right? Wrong.
An XX Female will grow up to be physically female.
An XY Male will grow up to be physically male.
A XY Female (CAIS/PAIS, Androgen Insensitivity Syndrome or defective Androgen/Testosterone production) will look like a female, and depending on the sensitivity to androgen will develop as a female, except will not be fertile due to lack of overies.
A XY human that is somewhere inbetween will usually be assigned a sex as birth by the doctors, however many times this is a mistake and the child will identify as the opposite gender. Most of the time they are assigned female unless their penis is of a certain size that they 'might' develop as a male. (Yes there is a defined length, but I don't know it off hand.)
(The incidence of intersex conditions is 1 in 2000 live births)
Then there are the XXX, XXXX, XXY(Klinefelter syndrome), XXXY, XXXXY type of mosaicism.
A good summary of this stuff is at
http://www.betterhealth.vic.gov.au/bhcv ... 3BF91?Open
Understanding the opposite sex...
Now this is where the authors tend to get into trouble, and where it might be very well a good idea to partner up with someone of the opposite gender who has insight into things you might not know about.
How many females know something about 'peeing standing up' , how male males know anything about females periods? Some might 'know' about it, but they lack any ability to experience it. These situations are extreme, but it represents something that they will not have first hand experience with, and therefor might not take into account.
Males know practically nothing about breasts, which is very obvious when it comes to ones ability to draw them. They are not water balloons or watermelons glued to a torso. Males also do not understand female social circles. Males definintely do not know anything about female/female relationships.
Females do not know anythign about male facial hair. Females know nothing about male social gatherings. Females do not know very much about male/male relationships.
So here we have an interesting situation... how do you get a non-stereotypical representation of the opposite sex without that special insight?
For most authors, I think they just ignore it completely and go with what they know, which tends to be insufficient, and falling back on stereotypes.
There is also the aspect of sexuality that authors really have no experience with. What does a straight female know about gay male relationships? What does a straight male know about lesbian female relationships? Apparently not very much.
If we want to extend this discussion to Television for a moment, television always uses the stereotypes, because that's usually all the writers are familiar with, or they have censorship rules to abide by that prevents them from breaking the stereotype.
Going back to the original point in this topic, why the guide doesn't have a specific 'male' or 'female' lead character category... is because differentiating based on physical sex alone is a bad thing.
I did cover the sexuality part in the guide, or most of it, and I did cover the TG part, but simply going 'male/female' won't work, because (even from the poll above implies) not every comic can be polarized in that fashion, and many comics mix male and female lead characters, thus making it not very usable to select 'male lead' and 'female lead' when they will have to select both anyways.