Deep throating can be a part of a BDSM session and it enforces the power of the Dominant. This picture depicts what I would define as a really good deep throating. It also becomes a sort of breath play as the gag reflexes kicks in and this is were the Dominant has to be really attentive as gagging may cause panic reactions. The exercise becomes a nice challenge to any sub that is up for it and has a bit of competitive edge