Sixteen people tried to enter the local Club for Men Only this month. However, there is a precise rule that states who can be admitted to the club: of course the candidates can't know the rule before entering the club, so eight of them were rejected.
Here are the people who were admitted:
And these are the ones that were not admitted:
What is the requirement to enter such exclusive Club?
Credits: I created the avatars using avatarmaker.
As stated in the title, this club is for men only. This means that it makes no sense to apply the admittance rule for (most) women. Or at least the evaluation will be too trivial.
As already leaked by @Steve in the comments, names definitely matter: they are not just labels to refer the pictures. However, if you really want to be admitted in this club you won't necessarily have to change your name: you can also...
..cut and/or grow your beard or hair. In some cases (Eduardo, Franklyn, Matthew) cutting beard/hair is not enough and the only option is growing one and cutting the other. If you are bald it could be the case that you cannot enter the club for good.
Only two letters of the names matter.
Hint 5 (definitive)
The requirement is not just about the name and/or the facial hair coverage. It is something about some kind of relationship between the two. The length of the hair and beard of the candidate is measured and somehow "compared" with (two letters of) their names.