I also have had the opinion for a long time that if I make a connection with the other side of the veil and send out a mental advertisment saying "NO CHILDREN WANTED", I simply won't have accidents. Why would a soul come down where it wasn't welcome?
If anyone wants to try this I suggest they do what I do and use the best contraception they can as well ^^ If you make the message but then play with fire in practise it sends a bit of a mixed message that I think could be interpreted as an invitation. Also there's the risk I'm wrong here