My two boys get along very well but have been in minor scraps over chews before, violent enough to draw blood, because I have one who will deliberately taunt the other with his treat sometimes and I might miss that he is doing it. They can be best of friends 99.999% of the time but never underestimate the possibility of such flashpoints with males or females. But that isn't gender related, it is just a dog management issue and is why I really encourage a good understanding of what can create potential problems. Very few dogs are serious problems in themselves; it is the management that is the issue once there is nmore than one dog in the house. Having more than one is extremely rewardingm, but also introduces new challenges. Each additional dog increases that challenge by another bit but as our breeders here with numerous dogs can testify, good management and the mild temperament of this breed generally means they are almost always easy to mix together, whatever the gender.
Neutering definitely can make a major difference with both males and females, making it a lot easier for the average pet owner to keep more than one dog. The male dogs that I've had who were more in your face tended to be those who were unneutered still at age 5 or 6 and had very well established male behaviour patterns. Also this was dependent on the individual dog's personality, and whether it had been well socialised or not.
Generally a puppy coming in to an existing dog household will be readily accepted and the pecking order will be established as he/she matures. Most of the time you will not even be aware of it and it will not be of any importance to you or the dogs except that each dog feels most secure and happy when it has its place -- and doesn't care where in the order it is.
The problems tend to arise when the owners feel the first dog 'should be the top dog' and intervene by treating the original dog as more important even though often the dogs themselves have an order where the second is the top dog. Interfering in this way can cause enormous anxiety and make the second dog feel it has to prove its status, creating scraps where they never would have existed. So we humans can accidentally create problems that may seem like they are testosterone related but are actually created by us! That's why it is always best to treat dogs as separate but equals, too -- that helps ensure a peaceful household.
I've always seen more issues with females with females, than males with males, but nothing really major.