My thinking was along these lines too. I say 'fuck' in its variety of a forms LOT in everyday life, to the point that it's often unconscious, a default word. I'm also a very expressive bottom. I'm not a screamer or anything, and I CAN be silent or very quiet if the circumstances require it, but that takes a lot of concentration because I have absolutely no qualms about vocalizing my feelings. Whenever a guy fucks me, regardless of his technique or the size of his cock, or whether we've fucked a lot and have a rapport or are just hooking up, when you fuck me you absolutely hear how much pleasure you're giving me and/or how much I appreciate you giving me that dick and using my hole to get yourself off. The sounds I make run the gamut from moans, grunts, pants, squeals, etc. to fully articulated words. But I don't put any conscious thought into it. If anything I enter a more purely sexual, animalistic state when I'm getting my hole fucked, and my responses are on that level - my body and mind invoking sounds in response to my pleasure, or pain, or how my hole is being satisfying by getting deep dicked, or how hungry it is for your cock and loads.
So if I say 'fuck' a lot while I'm being fucked, it's probably more because I say it all the time anyway rather than one purpose. When I present my hole to be used I'm super communicative, but not really communicating literally. If that makes any sense?