She is a guy, lol.Sakure looks like a guy =O
Shes strong physically.
Shes agressive.
Shes got big head.
She has cut her hair when she grew up just like most guys do
She;s got no tits. (important fact)
(it is unknown due to...) Has he got a penis?
She is a doctor. doctor House is a man, so is Sakura.
She was staring at hinatas breasts while healing her - that's normal for a guy.
And finally, the strongest point, which you have actually made lol
She looks like a guy