We also noted that even within the marriage relationship, it could still be sinful to use birth control. It would also be sinful to use birth control if it represents any reason other than the glorification of God. Using birth control may properly represent the desire to better care for God's blessings or to prevent the endangerment of more children due to some physical limitations. The key element in all of this is a proper motive which seeks to be a responsible steward over the privilege we have to play a part in the procreative process. Assuming, therefore, that birth control is being used properly, for the right reasons and with the right motive, Christians often look at effectiveness for the next criteria.
Imperfect people create imperfect things.
So, in the quest for the most suitable form of birth control Christians will wrestle with that which is the least imperfect. Finally, the Christian is interested in convenience. Because of the nature of the procreative process, comfort and convenience are pertinent considerations as the Christian couple seeks to enjoy God's gift of mutual sexual pleasure while still being stewards over the bearing of children. The ideal is to find the vaccine which, upon injection, prevents fertilization. The reality is that, so far, the results have been less thatn satisfactory although the quest continues.