can the creators of the userpages choose what gender can view their userpages? for example, if the creator of the page is a male, he can choose if both, males and females can view it or ONLY males. and vice versa
Don't think that wud be possible. Even if you separate the members in two different usergroups depending on the gender, people will find ways to view them, change the gender field in your profile for a moment, check the page, and change back the profile info.
The first suggestion is a sensible one tho. PM -S- for a quick response?