I got pretty jacked women in my family and we play armwrestling often. I have seen them all arm wrestle.
My ex-wife had visibly muscular arms and was into her own unusually strong upper body (for a person of her weight and height). If a friend, female or male, commented on her biceps she'd often put up her arm into an arm wrestling position and offer a challenge. She nearly always won against the women. There are pictures of her on this site I posted years ago.
She challenged me all the time as she increased her arm strength to exhibit those freakishly strong arms.
Not girls but I arm wrestled a girl in my gym. I beat her in right hand but in left hand she beat me very convincingly.
I had almost the same thing with a drinking buddy a couple of months back, although thankfully my loss was a close thing after a couple of minutes struggling, his loss wasn't. Still, it smarted to have been bested for the first time in years.
I'm wondering though whether my hemispheric strengths are imbalanced, or his.
Ever seen 2 females going at it at arm wrestling in real life?
We had 3 strong girls at school who used to arm wrestle each other (and the boys) and they always struggled to beat each other. All three girls could beat all but 2 of the strongest boys in our class. 2 of the girls remained locked dead level for several minutes.