Yes, this is called the "mating dance."
Its not "supposed" to be anything in particular. It seems to be personal preference in my experience, everyones different.
If they have voiced their preference on what gender to be called then the proper way to address them is by their preference; however if they dress in a fashion of a male or of a female then there should be no problem addressing them with that particular gender if they have not voiced their preference.
The wall of the uterus.
The baby grows and develops in the uterus.
The Ovum is produced by the female's 'ovaries'.
A Female Reproduction Structure
uterus
Maybe she is a lesbian. Or bisexual with a female preference.
Implantation occurs in the uterus of the female reproductive system. The embryo then develops in the uterus.
When a female beta is ready to breed she develops a horizontal line the length of her body.
usually but not neccecerily the male
There is no particular name for a female possum.