In a brazen display of my "overuse it to death word of the week", namely, hubris, I will say that I disagree with the contention that "fuck" came from Old Dutch rather than AS. I think M-W's etymology, which lists the Dutch fokken as cognate, makes perfect sense. Given that all those stinking Huns probalby spoke similar languages, how can these pundits pontificate so pointedly that the sexy Angles stole fokken? Isn't it at least as likely that both they and the early tulpenklompenvolk had very similar words for the same rather essential function?