It is responsible to plan for parenthood.
Sam and Sally have sex every single night with protection on at all times because they are unable to afford a child, and don't believe in abortion.
Sam wants to try something different.
Sam asks Sally to have sex with him in the woods instead of at home.
Sam tells Sally he wants to try it with no condom, and promises her he will pull out in time.
Sam and Sally have very exciting sex, both feeling thrilled.
Sam is unable to pull out in time, and Sally gets pregnant.