There are both males and females....they seem to bear fruit at a young age so they're easy to tell apart. The fruit is VERY messy, and dangerous to livestock at times (they eat it and some get it wedged in their digestive system...they can breathe ok, but nothing can get past the osage fruit)
They can be a very scrubby tree...they're covered with thorns, the wood is very strong...breaking even a small branch is difficult, and these thorns are the same...your flesh will rip very deeply before the thorn would even think of breaking.
The wood is very good for inserts or stoves, but inappropriate for fireplaces (IMHO) because of the amount of sparks this wood will throw off. Some of the hottest burning wood, up there with locust...actually, a bit hotter I think.
If you grow females, be prepared for many 'volunteers'....the 'critters' eat them as scatter the seeds everywhere. Not good for truck tires, as even the small seedling trees have thorns.
We have many hundreds of hedge trees on our farm...I'm trying to cull the females as I go...some are very old, with a diameter of over 24".
This website is interesting, check out the link 'osage orange profiles', from what I read quickly it describes the tree very well.
www.osageorange.com