In the end, no amount of evidence will save you when they have it out for you because you're a man. There is the famous case of the German train conductor Ralf Witte and his friend, who were both falsely accused of rape by the friend's daughter. They were falsely imprisoned for a combined 10 years before the ridiculous verdict was overturned, even though the daughter was a known liar, frequently submitted contradicting testimony and they had alibi for several of the dates where the supposed rape took place. Among other things, the daughter claimed that Mr. Witte took her virginity, then later claimed that she had been enslaved in a human trafficking ring years earlier, directly contradicting her earlier statements. Any evidence not fitting the story that the judge and DA wanted to hear were simply explained away as the victim "misremembering".
It means that it's far less likely that you could do so unobserved, which makes it harder to explain away the lack of observations for a false claim.
Also, it sends a message that might be a deterrent to a false claim.