True enough. However, the "uncleanness" given as a legitimate reason for divorce was not, "I got tired of the sex," or "I met someone I like better," or any number of excuses for marital failure in our society.
Jesus and Paul were dealing with GUILTY spouses VERBALLY divorcing their INNOCENT spouses without a writ. Jesus about Jewish culture. Paul about Roman culture.
The penalty for adultery was death, not divorce. By all means, though, let's just follow traditions of indoctrination.