Gay Star News has published a pretty basic but good article on post play drop here. Worth reading if you’ve experienced it and are trying to understand more about what happened. I found it interesting to see all the potential causes that they list – endorphins, adrenaline, internalized shame, loss of sense of self, lactic acid, feelings of guilt, etc. In the same ways that BDSM highs are complex and multi-dimensional phenomena, the lows are clearly equally faceted.
The image is one used in the article and taken by istolethetv. Specially this is from the Folsom Street Fair in 2015.