You seem to refuse to understand the analogy. It's about responsibility for the consequences if the risky behaviour turns out bad, not about penalising the risky behaviour as such. They may have made the same decisions, but if one but not the other feels violated afterwards, than the consequences have been different, a difference any legal system takes into account.
??? I'm getting lost here. What do you mean when you say a legal system takes into account how people feel after the event? Can you give an example?
If a man and a woman got drunk and rode motorbikes together, and the woman hit a pedestrian who died on the spot, the woman but not the man would be additionally charged for criminally negligent homicide or some such, which comes with jail time of up to 10 years, a multiple of what even repeat offenders have to expect for DUI.
But that's because the woman has done something that the man has not, which isn't the case in the example presented (two people engaging in risky behaviour together). A better analogy would be if the man and the woman got drunk, rode motorcycles, and then hit each other. The law doesn't care who got injured or how much, let alone how they feel about it. All they care about is how much each contributed to the outcome.
There's a concept in law called a 'strict liability offence', which maybe a useful one to include here. For a normal criminal offence you need to prove both that the person acted in breach of the law (Actus Rea) and that they intended to act in that way (Mens Rea). There are, however, a limited number of offences for which you don't need intent (Mens Rea). Speeding is the classic example. It doesn't matter if you intended to drive fast or not, you're guilty if your car moved too fast while you were driving it.
What seems to be being argued for here is moving rape and sexual assault towards a strict liability offence, such that it doesn't matter whether you intended to have sex with someone without consent, merely that consent was not in fact obtained. This would certainly improve the conviction rate, but if existing offences are any guide, it also greatly increases the accidental conviction rate - whereby people are convicted of technical offences they had no idea they were committing. This is why, in law, strict liability offences are largely limited to very minor offences, such as parking tickets, and not used for more serious crimes where the consequences of a miscarriage of justice are more serious.
Bearing that in mind, are people here who support such a shift doing so because they think that miscarriages of justice can be avoided or mitigated in some way? Or is it just that they don't care whether they occur? (because they'd be too small in number to worry about, or because they think it's a price worth paying?)