I assumed that the problem wasn’t that the husband lacks masculinity, but rather that he lacks sexual technique.
If the guy is 50 pounds overweight and she was never attracted to him, she might become attracted to him if he lost the weight, added muscle and broadened his shoulders. Facial hair can cover up unattractive features and feminine features (e.g., a weak chin). There are probably steps most men can take. If he’s too nice, he can learn how to be more assertive.
There isn’t one answer for all men. But when so many women talk about whether a man “knows how to use it” and so few men do, sharing that knowledge is helpful to many.
I bet she’d be proud to know that a thread on sexual technique has turned into a discussion on whether it’s unfair to claim that the men are to blame.