Because you're making decisions for them. In particular, "...is not worthwhile: it might be better for women if you simply have no non-marital sex at all".
Besides, it's funny how in the scenario where two people got drunk and woke up in one bed in the morning, one of them (hint: the one who has agency) is the rapist and the other (hint: the one without agency) is the victim.
I am not making decisions for them. You might be mistaken about the best route to work in the morning. That does not mean that you are not an agent or that you do not decide which route to take, or that I am "making decisions for you" if I notice that you are mistaken.
I am not the one who decided who is called a rapist in your scenario; in fact, I suggested (even if it was between the lines) that the term "rape" in that scenario does not fit very well at all.
I've started a podcast called Future Strategist which will focus on decision making and futurism. I have created seven shows so far: interviews of computer scientist Roman Yampolskiy, LW contributor Gleb Tsipursky, and artist/free speech activist Rachel Haywire, and monologues on game theory and Greek Mythology, the Prisoners' Dilemma, the sunk cost fallacy, and the Map and Territory.
If you enjoy the show and use iTunes I would be grateful if you left a positive review at iTunes. I would also be grateful for any feedback you might have including suggestions for future shows. I'm not used to interviewing people and I know that I need to work on being more articulate in my interviews.