Turkey sexing?

[Chickenraiser1995]

I have two 3.5 month old BB White turkeys. I'm not sure what genders they are.. They both occasionally strut and I recently noticed them trying to mount each other or at least assert dominance. I have people saying they're ladies, but I don't know.

 

[HuskerHens18]

I've never owned turkeys so I'm curious too