Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, the All-Merciful, the Mercy-Giving
All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.
Gender relations are guided in Islam by lowering the gaze, avoiding being in private or flirting. These are values that one must keep up with as a guide from Allah Almighty and His prophet (peace be upon him). NO man or woman can monitor the other person to feel safe about that. Trust is the base that should bring peace into hearts and tranquility towards each other.
My advice for the sister is to keep a space of trust about her husband and if he is to do something wrong it is a sin between him and Allah. She can never stop him from doing haram if husband wants to plus the more she brings that in his face and make it an issue, the more he might tend actually to do it.
Almighty Allah knows best.
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