Thomas could simply abstain, wear a condom or go to a country where they will happily perform a vasectomy in exchange for some money.
I wonder how many people there actually are that honestly and wholeheartedly want to see the extinction of the human race? Surely they need help in coping with the futility of their life...
You hear of people having ten, twelve children? It's like blooming heck.. you've spent more than 90 months pregnant. Do you have a life?
It's ignorant to have loads of kids. Many of people my age don't really want children due to environment issues and not wanting to bring a kid into this savage world.