In case it isn't clear from the title, this image could be triggering for some people. I sometimes question whether I should include the image, because I don't want anyone reading it uncritically, but I also feel as though I cannot talk about it in any detail without including it... I apologize in advance if anyone is offended by it (I sure as hell was).
I saw this on a memebase site, and I just want to reiterate that rape jokes in which men are the victims are still not funny. The point of this "trolling" site is to do things to deliberately trick or annoy people, sometimes they are very funny, but they sometimes really cross a line.
It's simple, both parties should enthusiastically consent to sex, and that this consent needs to be ongoing. If one party changes their mind and the other continues, it is sexual assault. It doesn't matter why the other party changes their mind, just that they changed it. The thought of what this would actually look like makes me a little sick to my stomach.
Male victims of sexual assault have the lowest reporting rate because it is often not thought to be serious when it happens (the whole can't-rape-the-willing bullshit). This can make it incredibly difficult for male victims of sexual assault. Females sexually assaulting males is relatively uncommon, especially compared to statistics with women, trans people or children as the victims or male on male assaults, but it does happen and it is not funny. Let's stop complicated things... if any of the involved parties do not want to be involved for whatever reason, it is assault.
I also wrote about a similar "joke" here, but it had the woman as the victim.