SEXY HOT STEAMY DRAMAS

I think most recent show is lovestruck in the city. It's quite non conventional for a kdrama but given its a web series, not surprising

Chinese dramas are by far more mature and are getting better in production value.

You should try this Thai drama, My Husband in Law. If you like that than you should try My Secret Bride.

If you like the fast development of Japanese dramas you might like Coffee and Vanilla and Shanai marriage honey. Also even through this doesn't fit the criteria you wanted but Love Last Forever is such a cute and wholesome drama, like you need to watch it if you like the other Japanese dramas.

As for Chinese dramas there's The eternal love(the one with Liang Jie and Xing Zhao Lin- SOOO MUCH CHEMISTRY) and right now I'm watching She is the One and I'm surprised how fast they're progressing.

Why are k-dramas so tame when it comes to intimacy?  Are there broadcasting restrictions or is it simply a cultural-market performance thing?

A relatively short drama, but SOO hot! 

https://mydramalist.com/64767-ban-yin

https://mydramalist.com/62337-you-are-my-glory I think that it fits pretty nice. 

"You Drive Me Crazy", maybe?