Our mistake. We truly thought you were asking for help when posted asking how others deal with this.
I'm guessing English is not your first language and that is the reason for the grammar issues.
You have the choice to spay or not, but you made it sound like it was a financial issue and when people offered helpful advice with that you said it wasn't.
You are going to do whatever you want. I do feel sorry for your girls though. They are being made very uncomfortable and are being put at risk just because that is the way you want it.