I remember this one being a older style anime. Can't recall much other than it's a dude that goes to a lady doc or professor and she teaches him how to please a woman. Outside of that, I can't entirely recall much on this one xD

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Edit: After thinking... I believe I recollected a couple scenes. One where she introduces the lesson and shows she's not wearing panties, to which she instructs the guy to start to fingering her while she directs him to her G-Spot. Another scene in which she shows him a 69 and goes to town on his dick, while he eats her out, only for him to gain some courage and finger at her asshole which she sorta goes against but quickly approves.