gender spell

close your eyes, think about what you want to acomplish, and a spell will come to you

You have to believe in your magicks also, its very advanced stuff changing gender. If you make an incantation aswell, make sure its in a language you will never bother learning. I mean, if for some reason you made the incantation "man and woman", it would be really embarressing if you suddenly grew bigger breasts than your wife to lmao!
I can think of 5 reasons why a dude would want to TEMPORARILY change gender.
Curiosity of what its like.
Because he can look at breasts all day.
To seduce a dude into a horrible trap.
The operation costs too much.
Women are obviously highly superior to men and its obvious why every man should want to be a woman!