Is Wordsmith's Anu Garg a male or female?

yes

because it is

I have always placed the female into the males tank and have had good results doing that.

It is because your male cat is still entire. As far as he is concerned, it is natural for him to try and mate with the nearest female cat, regardless that she is spayed already. You may want to...

Females and males possess different body parts and hormones, simply put.