Where did this 10,000,000:1 number come from? Why 10^7:1, why not 10^100:1? I can't find evidence that men are millions of times more likely to lie in harassmen

Where did this 10,000,000:1 number come from? Why 10^7:1, why not 10^100:1? I can't find evidence that men are millions of times more likely to lie in harassment cases.