Canadish said:
The other problem with that is that the current attitude held is that "Only Men can rape" and to suddenly have it so that all sex is illegal unless the girl agrees later that it was consentual...it's going to leave men paranoid about having causal sex because he might be getting into bed with "that girl" who's vindictive monster who has the legal power to ruin his life at a whim.
That's just not a healthy thing for people to constantly have to worry about.
Sex doesn't need to be anymore terrifying for a guy, on top of the fear of getting a girl pregnant, or performance issues, or whether he'll mess up.
It's shit, but sexual fear is everywhere in society. Think rape accusations are scary? Rape itself is scarier. For women in the casual dating scene (and pretty much everywhere else), it's also a real and worrying threat. I agree, sexual fears are not healthy for people to be constantly worrying about, but as it stands they're out there for everybody. I'm not saying this to devalue what you've said, because what you've said is important, but rather I want to add on that with how society handles sex, the whole thing is pretty damn scary for everybody.
But
this is why consent is so important. This is why you should make sure you get a 'Yes', 'Oh god yes' or 'MORE! YES! FUCKING HELL, YES!' every time you have sex. With a long term partner, trust and experience can let this be as simple as a body signal. Worried about sleeping with somebody who will abuse your trust? Make sure you have their consent, make sure they're comfortable and that they're sane before you even undo your belt. If you don't feel safe having sex with this person, then you can say no as well, your consent is just as important. Every worry you listed above is real and important, and if you're having any of them before sex, you should think about whether you really consent to sex with this person. It's not just about your partner's comfort! Protect yourself; If your partner isn't horny, happy and as ready as you are (Or if you're not as rarin' to go as them!) don't press on regardless, because there is a lot to worry about with sex, and consent and understanding are the only real defenses. I say all this in general, rather than directed at you Canadish, as I have no idea about your sex life and I wandered off topic a bit. I'd hope it was good advice for everyone regardless.
Let's face it, do you really want to have sex with somebody reluctant? That's shitty sex right there. In the name of awesome fucking and sexual safety, make sure to get that loud, clear Yes. Consent should be something we strive for, because true consent is the best defense against most of what we fear from sex. Consent isn't something you should try to get so you can prove your innocence in a courtroom, consent is something you should make damn sure you have so you never worry about ending up in one.
Also, happy sex is best sex.
TL;DR - It doesn't matter if her 'not saying no' means yes or not if your standard for good, safe, awesome sex is a loud and clear 'YES!, however that may be communicated (and if you don't know this person well, ask and make sure no matter what!). It's safer, it's funner-er! It's sexier! Seriously, what's not to love? Unsure sex is shitty, anyway.