Have you considered putting your members into gender-based usergroups?
This way you could use the built-in permissions system (AdminCP -> Forums & Moderators -> Forum Permissions), and Forum Home will automatically display only those forums accessible to that particular member.
This is how most forums restrict access to a moderator area. A side benefit: the permissions system method won't be overridden by a later vBulletin upgrade, as a template update might be.
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