To my recollection, I never used the "Consensual" story tag. I never thought it was necessary when the story had consensual sex. But I added it to the story I'm currently posting a chapter a week, "High School Massacre."
The novel is a thriller/murder-mystery. As with all my writing, I don't hold back when describing a scene, whether it be graphic sex or graphic violence. And "High School Massacre" has some really bad people in it. The story tags reflect that - Ma/Fa, Coercion, Consensual, NonConsensual, Rape, Crime, Mystery, Violent.
Tuesday will be the next chapter installment. It's the first chapter with sex and it's not consensual. So I thought back to the story codes I had selected and they made it sound like a very dark story with no consensual sex. That's not the case so I added the "consensual" story tag. Now I know why it's available.