There's no need of separating the people in different usergroups, I will show you a way to do this manually, it's very easy.
1.- Add a new Profile Field: Single-Selection Menu
**---------------------------------------------------**
Title: Sex ( or whatever you want to name it )
Description: Please select one of the options below
Profile Field Category: uncategorized
Options:
Male
Female
( put it exactly as I'm showing you, type one hit ENTER and type the other one )
Set Default: Yes, Including first blank.......
Field Required: yes, at registration.....
Field Editable by User: Yes
Private Field: no
Field Searchable on Members List: no
Show on Members List: no
**---------------------------------------------------**
Which page displays this option?: Edit Your Details.
Now go to Styles & Templates > Search in Templates > and seach for POSTBIT or if you use the vertical posts search for POSTBIT_LEGACY. Double click the template to edit it and now find the following code:
<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]">$post[musername]</a>and replace with:
<if condition="$post['fieldX']==Female">
<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]"><span style="color: orange;">$post[musername]</span></a>
<else />
<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]"><span style="color: Blue;">$post[musername]</span></a>
</if>
fieldX = is the field that you created, you can see which field number it is by going to Admincp> user profile fields > user profile field manager.
The code before the <else> is the code for female sex and the code after the <else> is for male sex, so if you want to change the color you can do it by changing the name of it for example "red, yellow etc.. " or you can use HTML and replace the code for this one:
As shown above
<span style="color: orange;"> to use HTML colors:
<span style="color: #FF9900;"> that simple !
NOTE: This will affect every usergroup that has NO "Username HTML Markup" .. So lets say your registered users usergroup has HTML markup, you will need to go to Usergorups > Usergroups manager > Registered Users (edit) and remove HTML markup.