Chocchocporridge what are you on about? A man has power because he xan choose not to have sex? You don't seem to be able to understand. We are talking about the ability of a woman to falsely accuse after a sexual act has taken place. Are you going to suggest that this doesn't happen?
HOW OFTEN DO YOU THINK THIS HAPPENS? This isn't like accusing someone of nicking your watch - you'll go for invasive medical testing, you'll be grilled by the police, then you'll go to court and have your entire sexual history raked through. Exactly how many women do you think are prepared to do that?
Of COURSE you have the power. If this is a concern, then don't have sex. Don't put your penis in anyone. Super easy, entirely within your control.
You seem not to be able to understand, I'm seriously worried about any women you encounter, because you apparently have trouble figuring out if a woman is consenting, and think that they'll turn around and accuse you of rape the next morning on a whim! You must be a terrible judge of women! Honestly, wait until they are sober, and straight out ask if they'll have sex. Whilst having sex, check again that they are fine with it at various points. If at any point they say no, immediately stop.
Generally, this kind of advice isn't necessary, but since you seem to be finding the whole concept so hard, I think you need to go back to basics.