Please don't take this the wrong way, it's not intended to be harsh or mean in anyway there is just no gentle way to say it. I realize you are unsure if it's what you really want to do so hopefully you will take the information as it's intended and it helps you make your decision.
The fact that you don't know this is a pretty good indication to me that you are not ready to breed. Females don't get fixed, it's a very invasive procedure for females and it's only done when medically necessary and even then it's debated on very heavily by the vets and the owners.
It's not a bad thing that you don't know, many people don't, but it is a very good indicator that while you have done some research, you haven't researched much about breeding YET.
Breeding gliders is not by any means an easy thing and shouldn't be jumped right into.
There are a lot of things to consider when pairing up a breeding pair, breeding trios can be even more complicated with even higher risks. Even long time, very experienced breeders have difficulties with breeding trios.
I personally had owned gliders a minimum of 3 years, researched specifically about breeding, and had a veteran breeding mentor hold my hand the whole time before I was even close to being ready to experience breeding.
I started out with the MOST ideal situation possible. My pair had 3 individual joeys then we neutered Dad and the one male offspring. I learned from each joey they had. Even with all of that, I was still nervous and felt out of my depth and sometimes still do when it comes to certain issues with breeding.
Fortunately, I never had to deal with a rejected joey myself. It's no joke hand feeding a rejected baby. It's work, and emotional, exhausting and sometimes devastating.
A few weeks ago I met a girl from this site with a rejected joey that wasn't thriving. She happened to be local to me and I actually got to meet her and the joey.
I was out of my depth with that situation and hooked her up with someone more experienced with first hand rejected joey care. The owner worked her a$$ off night and day tending to that joey and took alllllll the advice being hurled at her, and for a few weeks he started to thrive and gain weight.
He was doing so awesome and was just starting to eat on his own and we were so happy with his progress.
Then he took a turn last night and within just a few minutes he passed. There is absolutely nothing the owner could have done for him and I am so proud of her and the lengths she went to give him the best possible chance she could.
This is the downside to breeding. It's absolutely heart breaking to watch and go through. Sometimes There are no answers. There is no 'reason' you can put your finger on. It's just part of breeding that you have to be ok with and knowledgeable enough to handle or find someone that is that will help you.
Now I didn't ask if your female is lineaged or not and I don't like to assume.
If she is not lineaged, and if you don't know what that means ( and many people don't) it's not wise to breed her.
There is no way to know if she is related to the male without lineage. It doesn't matter if the gliders came from different people, or different states even. The gliders could be related, gliders are shipped all over the country it is not uncommon for someone to get a glider in fla, and a glider from ny and find out they are related, without lineage there is no proof that they are or are not. That alone is reason enough not to breed her for most of us in the community.
Now I'm not saying you shouldn't everrrrr breed.
What I am saying is, if that is really what you want to do, even if your only wanting to breed for yourself..... please do more research specifically on breeding and know what your getting into.
Some great places to learn about breeding are..
The breeding 101 group, it's strictly about breeding and breeding education. It's also a great place to ask for a breeding mentor that will help you learn. There are a ton of experienced breeders in this group that WANT to share their experience and knowledge. And there are a ton of inexperienced people there that are learning. This group is a very strict no drama group.
https://www.facebook.com/groups/breeding101/
The sugar glider nursery is another great site that is owned by the same person that runs the breeding 101 group
http://www.glidernursery.com/breeding.html
Another great resource is
https://www.suzsugargliders.com/breedingsugargliders.htm
Then if you still want to breed, get a lineaged pair to breed ethically and responsibly and let non lineaged gliders be pet only.
If those boys are intact, and currently get a long. Introducing a female to them could change them getting a long and cause fighting between them. They will potentially fight with each other for breeding rights to the female.
Trios with two intact males and 1 female is probably the most complicated trio combination there is regardless of lineage.
So I would reallly consider neutering them before they even get a whiff of the female if they are indeed intact. They will need at least a month after neutering for their hormone levels to decrease to reduce the chance of fighting over the female.
Now if they ARE neutered...... there shouldn't be any issue introducing her to them. It is a then back to the normal 50/50 chance they will all get along instead of the higher risk that they won't.