I am an adult and goddamn it, I like SEX, drama and romance when I read. Recently Korea has been putting out mature, ecchi/smut webtoons (manhwa) ... and man they are worth the read. Some are more about the art and sex but there are some that are worth the read for the plot. But if you need to 'satisfy' your needs, with great art in ALL COLOR ... I got you. The order is from least favorite to favorite but if anything, definitely peep the top 3. Full of heartbreak, romance, cheating (NTR) and filthy greatness.
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Woodman Dyeon and Unbalance are upcoming ecchi webtoons and Second (while not in all color) looks like it could have potential. But anyways, happy fap-reading!
You can find these at http://yomanga.co/
You can find these at http://yomanga.co/
^^^The extra aforementioned 3.