Here's my input. The facial shot is something no self respecting porno flick would be without, and as most of the films are made for a male market it can be viewed as a dominance/submissive act. Generally the woman is on her kness or back with the man looming over her depositing his cum.

However, if both participants are willing there is nothing like watching your warm sticky fluid trickling from a set of full lips across high cheekbones.

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