Welcome to Lewd, Agony!
I don't know how much High School DxD you've watched, but in addition to the main series there's also some OVAs and spin-offs you might be interested in, you can view them on MoeTube here.
Another good action/ecchi anime to check out is High School Of The Dead, which is about a zombie apocalypse centered around the survival of a small group of students. The ecchi is a lot more tame than in High School DxD, but I think you'll still like it based on your preferences. This can be viewed on MoeTube as well.
One of my favorites as of recently is the series Fate/stay night. There are also two spin-off shows to this, Fate/Zero (a prequel), and Fate/kaleid liner Prisma Illya. (a magical girl spin-off) The general premise of this series is that there are mages battling each other to the death to obtain the Holy Grail, a magical artifact that can be used to grant any wish to the one who obtains it. Fate/Zero and Fate/stay night are more on the serious, action-packed side and don't really feature much ecchi. Fate/kaleid liner Prisma Illya however takes a much more lighthearted approach, incorporating action, comedy, romance, and ecchi all into one sweet package.
Here is a video clip of one of one of my favorite action scenes from Fate/kaleid liner Prisma Illya:
I'm not sure if you have a preference over dubbed or subbed anime, but I linked to the subbed versions as they are much easier to find. (you will find in many cases, this is the only
option for some anime. You just get used to the Japanese voices eventually) If you do
prefer subbed anime though, I suggest that you start watching on Crunchyroll.com
. It's basically Netflix for anime, and it's constantly getting updated with the latest from Japan! You won't find many older shows there though, so you'll likely have to watch those illegitimately on other sites like MoeTube.
Thanks for joining, I hope you enjoy it here~