A pretense of force is a powerful way to give up control if you are a bottom, and to exert control if you are a top. And in fact, in a hard scene, the bottom is testing himself, seeing how much pain and humiliation he can endure, so on some level he is "unwilling."
The website breederf*.com, plays on the fantasy of force by portraying straight guys being kidnapped or tricked into a scene by one or two tops. They are tied up. They get some light BDSM. They are humiliated. And they are forced into sex.
The full post, with nude photos, sexual situations, and the actual name of the website, is on Tales of West Hollywood.