Apparently Leah just discovered the Internet.

" Its use in a political context has become a racist/sexist slur against white male liberals who are seen, in far-right circles, as traitors to their race and gender. The implication being that if you are a white man defending liberal values then, metaphorically speaking, your wife is being … uh, you get it."

No more so than the F word implies actually having sex - it doesn't - it is simply a generic vulgarity - cuck is equally unflattering except it escapes most profanity filters which has lead to its higher prevalence in recent years.  In the context given here the term "Libcuck" would be more applicable but not common enough to justify a Globe article.

Recognizing that the rest of the article falls apart. 3/10