Access to a particular set of information granted on the basis of having a vagina.
Nora: Sorry Andy, that's classified.
Andy: Pssh, classified schmassified, I have a clearance.
Katilynn: Haha, what gives you clearance?
Andy: Haha c'mon I know you both love me, don't fight it. But if you must know, it was the TSA.
Katilynn: Bahhaha you have to have a vagina to know this business :) sorry Andy.
Nora: Vaginal clearance is required.