What does BCD mean in an ad?

[Fancyinheels]

BCD, behind closed doors, refers to intimate activities in the bedroom, lad, a way of indicating but not discussing decadent details publicly. Some ladies might post, say, a rate for an "hour of BCD" to be cautious in this era of FOSTA/SESTA new law/increased LE focus uncertainty.

You may also see it in regard to reviews, an alternative term for ROS or related to ROS access, the rest of the story, aka the hidden "hot and heavy" parts requiring more discretion in sharing.