Ok, I'm not a boy, so I'm not going to tell you what I read when I was that age.

However, the boys in my life have been seen to enjoy:

Beast quest (i have no idea if they're good, they are certainly popular)
any book every written by Andy Griffiths (of the day my bum went psycho fame)
The abhorsen series by garth nix
The ranger's apprentice
Philip Pullman's his dark materials series (starting with The golden compass)
eragon (towards the upper end of your age range)
The graveyard book - neil gaiman
The Hobbit - Tolkein
Anything Diary of a Wimpy kid/vampire/zombie dog
The dark is rising sequence - susan cooper
The power of one - young reader version
Across the nightingale floor (again, upper end of your age range) - lian hearne

The age range you're asking about probably straddles a couple of different ranges of fiction, 10-12's are reading differently to 13-15s. But that will depend partly on the kids themselves and their readiness for longer and more involved plot lines and/or more complex themes. FWIW I have no idea whether any of the above contain any rude bits. It's been too long since I read any of them.