Responses
Maybe this one?
http://www.mangago.zone/read-manga/ai_to_hanaji/
For comedy.
http://www.mangago.zone/read-manga/romantic_pornography/
There's also this one but the plot doesn't focus on the sex.
http://www.mangago.zone/read-manga/boku_no_omawarisan/
Do you guys know the og manga Futari Ecchi? I hope there's a BL version of it, where a pair of lovers struggle to get better in bed for the sake of pleasing the other and at the same time educate people on safe mlm sex