abdominal aortic aneurysm

I'm 38 years old and was diagnosed with a AAA about 3 years ago.  Its now 5.2cm and we're talking about surgery.  My doctor says that the endovascular method would not be good because of lack of space between the renal artery and the top of the aneurysm.  He did say that i could probably find someone to do it but he wouldn't.

I'm extremely concerned with what I've been reading about loss of sexual function as a complication of the open surgery.  I cannot find any solid information about the odds of this happening.  My doctor would not give me a straight answer and i've read in one place its a 7-10% chance and another that its up to 80% chance.

I understand what retrograde ejaculation is but it would not really affect me since I don't plan on having anymore kids (have 3) from what i understand doesn't affect performance.  

My concern is with erectile dysfunction.  What are the odds of this happening.  Would it be permanent?

Could someone please shed some light on this for me.

Thanks