I think he should get a vasectomy and you should not get your tubes tied. You're not sure and he is, that is enough of a reason. It is a much simpler operation for him than for you. Don't do it unless you are sure. Life is uncertain, what if you were widowed and met someone new, for example? A tubal ligation is very hard to reverse and iffy if someone tries to get pregnant after reversal. It is only something to do when you totally know you are over having any more kids ever no matter what.