Since testosterone isn't really helped by the cold showers, gender likely isn't an issue.
If you try this, the cold water on your back, between your shoulder blades, activated the brown adipose tissue there to kick in the burning of calories to stay warm (ie alive).
Apparently.
I learned this from Tim Ferriss's book "The 4-Hour Body," and coupled with no carbs in my diet last year (and setting my home thermostat to 59 degrees F), I burned ten pounds of body fat in 2 weeks.
Warning though: Between being cold and hungry all day, every day, for two weeks - it's literally torture.