It's just that he would have prefered to be in Capt. Mal's bunk.....
http://www.cnn.com/2011/09/28/showbiz/celebrity-news-gossip/sean-maher-comes-out-ew/
I have to admit, I didn't really follow him as an actor, and in retrospect from his Firefly performance, it can be seen a bit more obviously now but good on him for finally being able to admit this in what is normally an actor's death call in Hollywood.
http://www.cnn.com/2011/09/28/showbiz/celebrity-news-gossip/sean-maher-comes-out-ew/
I have to admit, I didn't really follow him as an actor, and in retrospect from his Firefly performance, it can be seen a bit more obviously now but good on him for finally being able to admit this in what is normally an actor's death call in Hollywood.