My first review...exiting!!! haha! Well! Anyways, to answer all the simple questions first:
1. Yes, this is a Yaoi, but only a soft one.
2. It is a romance, comedy and maybe a little bit of action
Gravitation was just something random I read both to pass time and to try something new other than reading my usual shojo, shoen etc manga, and before I knew it, eventually, after a few chapters, i was hooked on... sure the art may not be as great compared to other mangas but it makes up for it with all the comedy they put into it. A truly great read :)