I believe most anal scenes in porn movies are filmed after the actress does an enema earlier in the day. Not sure how you could guarantee a WG would do this before a session, unless she is a regular.
While not a huge fan of anal, the few times I have partaken have been relatively odor and sludge free. None of these times did I make any special request ahead of time, but I guess girls who do anal may do some extra cleansing regularly.
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