That is not lawful which is:

1. (1) contrary to an express provision of law;
2. (2) contrary to the policy of express law, though not expressly prohibited; or
3. (3) otherwise contrary to good morals.

History: En. Sec. 2240, Civ. C. 1895; re-en. Sec. 5051, Rev. C. 1907; re-en. Sec. 7553, R.C.M. 1921; Cal. Civ. C. Sec. 1667; Field Civ. C. Sec. 827; re-en. Sec. 7553, R.C.M. 1935; R.C.M. 1947, 13-801.