All of my rays seem to be inquisitive, with no apparent differences between male and female. Some of the male and female rays are more active than the others but I see no differences due to gender overall (among my 11 rays, including pups).
My male is rather shy, but they're both still new to the tank. She's starting to come out and play more and she's starting to realize when I stare at the tank, chances are high she'll be getting food.
LOL they are all over the glass the tank everywhere when its time to eat in the morning the 2 females swim to the top along the glass and splash the water around its pretty funny stuff.