Semen only proves sex. There have been several high-profile rape cases in the Orlando area that were later proved to be false. It's unfortunate, but there are a number of rape cases that are flat out false - either a nutcase or someone who really regretted what they consented to while they were drunk. How do you differentiate these scenarios beyond a reasonable doubt.
I don't like the situation at all and I do worry about this happening to one of my daughters. The best thing I can do is show them these stories so they know what can happen when young women drink too much.
"Semen proves sex."
Yup. And sex outside of marriage used to be illegal, as was adultery and homosexual sex.
All should still be that way.