1.City Hall: Funny, romantic, hot kiss scenes plus bed scene. 2.Coffe Prince: one my favorite. Hot kisses and bed scene. 3. Dalja's spring 4.devil Besides you (Taiwanese) 5. fated to love You (Taiwanese) Hot bed scene. 6. Iris 7.Myung Wol the spy 8.Personal Taste 9.Playful Kiss 10.Reply 1997 11.Scent of a Woman 12.Secret Garden 13.Smile, You 14.Swallow the Sun 15.The Princess' Man 16. Padam Padam 17. My Lucky Star All of the dramas listed above has a least one bed scene.
Haven't watched a lot of dramas but try Fated to Love You.
Last Cinderella was pretty racey and a good story as well!
Fated to Love you was pretty good but an emotional roller coaster (I would recommend the Korean version I liked it more.)
Cruel City has a sex scene, but not explicit. Also Que Sera, Sera.
it's okay that's love .. 
Heart to Heart - was really open about the subject for a kdrama
Witch's Romance
Hirugao - really racy for jdrama
You could try Secret Romance, but tbh I didn't really like it that much. You might though.
Kuzu no Honkai- It has a lot of racey scenes, plus it has an interesting plot (at least for me) and it expresses well the fact that teens also want to get phisically on a relationship.  
It has been frustrating for me to watch some dramas, especially when the characters are above 25 years old and act like unexperienced teenagers, they may be shy and it might not be appropriate to show to much affection in public but there are some scenes at the intimacy of home and nothing happens.

Come To My Place. Old drama which I just watched recently and felt was not too bad.

Suspicious Partner (kind of, it fades to black when they go in the bedroom) and What's wrong with secretary Kim (this one is hot)

pornhub or something, just search up korean sex scenes

 sumblink2:
I Need Romance is a good one. Also Personal Taste

Did personal taste have sex in it?

 Waltwiskers:

Did personal taste have sex in it?

just finished watching it not really. Hot make out session and fades to black(near the end of the drama tho)

Second Love and kakafukaka (jdramas)

Ashes of Love, Put your head on my shoulder, A love so beautiful, Oh my General, The Eternal Love, Sound of the desert (c-dramas)

My secret romance, something about 1%, because this is my first life, healer, fight for my way,suspicious partner, it's okay that's love (kdramas)

Mistress has like actual steamy sex scenes. The first few episodes were rated for adults...

https://mydramalist.com/26903-mistress