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3) What I meant here, which really should be obvious, is that the couple should be checked to make sure neither has an STD that they could transmit to the other. Even then, a condom is always a worthwhile and harmless precaution to take unless the couple want kids, which it would prevent.
A condom is not the best form of birth control, and they are not things I like at all. They are not "harmless", as they interfere with the pleasure that is possible without them. Fortunately, I am monogamous, and am happily married, so I do not need them for protection against diseases.
If God has not blessed one of the couple with infertility (I expect that you, Joe, may enjoy that joke given what you have said so far), sterilization is more effective, easier to use, and cheaper in the long run, than any other form of birth control. But, of course, there are other options that one can use, and several of them are more reliable than condoms for preventing pregnancy. However, if one is going to be promiscuous, I agree (from other posts of yours) that one either will use condoms or one has rocks for brains.