NAMBLA is an association of pederasts. It means sodomite, especially a man who engages in anal sex with boys. So, if you know Chloe from Catholic Discussion, this is pretty much a remark about the sex scandal.
There are some bishops who are saying that the homosexual tendency itself is disordered and acquired. It is not necessarily sinful, but it is not given to them by God either. (Personally, I am not so sure that is correct.)