A condom, by itself, is definitely not adequate birth control. Any barrier method, e.g., condoms, diaphragm, should always be used with a spermicide. A condom, by itself, is probably the least effective form of birth control, except for coitus interruptus.

I have, a couple of comprehensive, medical journal articles on birth control. They explore many other options, in addition to condoms and oral contraceptives. Please let me know, if you would like me to forward them to you.