Actually almost all good quality contraceptives are 100% effective if you properly use them exactly as prescribed.
The reason they are not always effective is, in the case of pills, people don't properly adhere to the dosage and take other drugs and things that they don't inform the doctor about.
In the case of condoms, don't be arrogant. If you get a size that's too big for you, of course spillage can occur somehow. Also if you have a big 'stick', don't be stupid and try to save money by buying the ordinary size. Be honest, buy the right size and you will be protected. Tears and such occur due to people going far too rough in a size too small and/or material too cheap that really shouldn't even be sold as a valid condom.
I would like you to show me how on Earth vasectomies and tube-tying are not 100% effective.