Dragons Rioting: check out this manga
a relatively new manga (well, came out in late 2012, early 2013) about a guy diagnosed with something called Hentai syndrome (which is the short name anyway) back when he was 6, which is basically a disease that'll kill him if sexually aroused. trained by his father in martial arts for 10 years after that, the protagonist, Rintaro Tachibana, would then vow to avoid women (and therefore avoid being aroused) in order to keep on living. however, as his luck would have it, he ends up going to a high school with a 99% female population, when he had originally assumed it to be an all-boys school.
this manga chronicles the adventures of Rintaro as he struggles to make it through his high school years without dying of his disease. or of the fights he'll inevitably get involved in.
link to the chapters here: http://www.mangahere.com/manga/dragons_rioting/
don't let the premise fool you though; while it is ecchi (on par with mangas like HSDK despite only being 18 chapters long so far), it is still chock full of over-the-top martial arts awesomeness.