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Sex where, usually the partner on top, is in a plank position. The bottom partner can be in any position underneath and any hole or area can be being penetrated: mouth, anus, vagina, breasts. The key is that this action also doubles as an intentional intensive core and ab workout for one or both partners.
Damn, my abs are looking ripped after all that plankfucking last night. I’m skipping my core workout at the gym today!
by Sheilalee July 17, 2018
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