This was a really good one.
AFAIK, most women really often don't say what they think, and this is especially true about sex. So we guys need all the help we can get! :-D
This seems especially hard to get for some women who always say what they think. They just can't see they are the exception and NOT the rule!
Of course this makes consent more complex than it may seem. For example, many women would NEVER express sexual "enthusiastic consent" to their partner, not even at gunpoint! (because they would find that too embarrassing).