I just used the shaver last night to seriously trim my armpits, chest/stomach area and my pubes/balls. I didn't shave completely, so I left just a little bit of hair. I've always had a pretty hairy chest and pube area. Never really had much back hair (doesn't really run in the family), but lately I've been growing a little (maybe from cycling) on the tops of my shoulders, and is creeping towards my upper back, but nothing to really worry about.
My bro shaves just about his entire body, but he's a personal trainer and is trying to get into modeling. I don't really think that shaving any body part is gay. When I play football I get my wrists taped so I shave off about a third of the hair on my forearm anyway.
I wouldn't say it's gay, especially if you have muscle mass that will be easily visible. If you're a skinny/frail little bastard and you shave everything, then I think you're just making yourself look like an even bigger pussy.