Kono S o, Mi yo! by KITAZAKI Taku [Scanlations Available]
kono is about a 22 year old guy named Rin who finds out that, what he thought to be an embarrassing birthmark on his buttocks, has mysterious powers over females. Upon discovering this new found power will he chose to use this as an advantage on his childhood crush?
It is a Seinen, adult, romance, comedy type of manga. (Not to be confused as hentai!)
6 Volumes (ongoing)( volumes 1-3 have been translated. Volume 4-6 have been released raw)
Serialized In (magazine)
Big Comic Spirits (Shogakukan)
It's a great series that I think deserves more attention, I sent a e-mail asking the status of translation to the other translator, but haven't a response.