Jason never said that you needed to obtain consent EVERY time. He also clarified that porn actresses, etc gave implied consent. I'm assuming any pictures you have that girlfriends or whatever gave you also count as implied consent.
It initially was targeted towards women, but I know their largest audience is gay men. They may have started targeting that audience by now; I haven't really been keeping tabs.
I'm pretty sure you have no moral purpose for your prudish concept of consent to jack off.
Actually, the entire concept is derived from moral purpose. Without consent, you are using that person for your own ends.
In a manner that does not involve the initiation of force...unless you stole the photograph. That's where the other person's rights in the matter would begin and end, though.