So essentially you want to change your sexual preference?Example:
You choose some determinate type of boyfriend/ girlfriend because your beliefs . So you make descisions in concordance with your beliefs. But , our beliefs depends 5 % of our consciuos mind. And 95 % of our unconsciuos mind.
Our beliefs conduct our behaviors and our descisions. Until the age of 7 you create your unconsciuos mind because you learn by hypnosis using Theta waves of your brain.
I read a litle about sigil magik... But I don't understand how you can change your unconsciuos mind if your brain is not using Theta waves. Because , when you charge the sigil ( ex : with orgasms ) you are awake. So your Theta waves are not activated.
You want to have a wider/different choice for a boy/girl friend?
That is the example that you are giving?
Scientists don"t know as much about brains as they would like.
Brains are still quite mysterious. So using specific figures like age 9, or 5%, are probably less accurate than they could be.
Also, we are talking about magick here.
If it works at all, it does it in a way that science cannot yet measure.
If you believe the sigil stuff, and the theta wave stuff, you could charge sigils in your sleep.
The dream state is a strange one, and that borderland between sleeping and waking is especially important.
But playing around in that particular arena could well leave you open to attacks by any entities that may be around.
Entity attacks that they usually call sleep paralysis could be an indication of this.
And one thing I learned long ago.
Sigils, and most magick, only works after you no longer want the thing you were asking for.
In fact, it seemed to me that this was inherent in the system.
The sigil cannot work till you have let go of the intent that is powering it.
My best advise is to look at this stuff if you are curious, but to try and change yourself through some of the more mundane ways that have been mentioned here. By making better choices, as @Riptide mentioned.