Hi,
I recommend Pin Anong, they have real lip to lip kisses uncensored, even though it is not french kisses. They also have sexual life and when they get together they have a lot of skinship. The female lead is annoying but gets better by the end. It is funny, the characterws are appealing. It was never boring.
Full House thai has also a really great chemistry. There are real kisses if I remember correctly and the ice cream scene is really hot. I really like this drama.
I have heard about Lying Heart in which there are hot kisses and sexy chemistry, but I didn't watch it.