Kallessa and I have sorta come up with our own definitions. For me a burly man is a strong hairy man perhaps with a “bear” type belly. By hairy, I mean all over hairy, btw. A brawny man is more of a bodybuilder type, without a lot of hair. That make sense?
Ah, I seeeee!!! Burly equals hairy belly. Brawny equals nekid six pack and pecs. 
First of all, is it “naughty” if you’re married? Second, I don’t wanna have any type of relations with somebody that has to be chained in order to be naughty with me. Me and swampy are gonna be “huggin’ and snugglin’ while watching movies” kind of married and that’s all right with me.
Finally, by bodybuilder type, we’re talkin’ reasonable here. No Mr. Universes, more like the muscles you’d expect on a buff construction guy (before he gets the beer belly–I think its a rule that construction workers eventually get a beer belly) or a working cowboy. Mmmmmm . . .a working cowboy. Huh, oh yeah, and a little bit of hair isn’t bad, but ideally he won’t need his back shaved.
You know, in reality, none of this matters. If he’s a sweetie, I’m gonna love him, but you know, the cosmos may be listening and feeling generous, right?