It means the guy has no problem to the idea of having sex
outside / before marriage. Even after he married, he will probably
do the same with other gals when tempted (cos he is morally ok with
sex outside / before marriage)
If hubby is against pre-martial sex, the wife will trust her hubby
even if misunderstanding occurs.
If hubby is morally ok with sex outside / before marriage, the wife
has reasons to suspect when any misunderstanding happens.