J.Y. Interpretation No.554

The legislature may enact a law restricting freedom of sexual behavior within the system of marriage (such as by making adultery punishable under criminal law), but only if the restrictions are not overly severe in violation of the principle of proportionality embodies in Article 23 of the Constitution.  In particular, the offense must be indictable only upon complaint, and no complaint may be instituted if the spouse has connived against or forgiven the offending party for the offense.