Whats the sex of my kenyan sand boa?

I really want to breed and Im going to a expo in the near future. Im really hoping its a male because he's 100 grams and 17 inches in length so he would be ready to breed if he's a male. I Appreciate the response here are the pics.http://s1267.photobucket.com/albums/jj552/PaulNStubbs/

Looks female. The best way to tell on a sand boa is to look at the tail.

females have very short and stout tails, males have longer thin tails.