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Bismihi ta'ala

This view has not been firmly established, and you must refer to your Marja' taqleed. 

And Allah knows best

Bismihi ta'ala

There are narrations that do mention some of these things, but most of our esteemed scholars do not mention it as one of the makruh acts during intimacy, meaning that they might not hold that level of authenticity. 

You must refer to your Marja' taqleed on this, but whatever the case is, it is not haram, nor even firmly established as 'makruh'.

And Allah knows best

If there was an understanding between them that he spends on her more than the basic needs of food and clothes and shelter and she looks after the household matters, such understanding makes it compulsory on both of them to full fil that mutual understanding. Some people say that wife has no responsibility at all at home more than matrimonial matters for her husband, but many scholars say that the understood agreement on her responsibilities at home matters and must be obliged.

Wassalam.

If by giving consent, her sister is saved from sin and poverty and staying single and not becoming a mother, then what a Mustahab act can you find better than sharing your husband with her?
have a look a these narrations:
 بإسناده عن عليّ عليه السلام قال قال رسول اللّه صلّى اللّه عليه و آله كتب اللّه الجهاد على رجال أُمّتى، والغيرة
على نساء أُمّتى، فمن صبرت منهنّ واحتسبت أعطاها اللّه أجر شهيد

"On the authority of Ali (peace be upon him), he said that the Messenger of Allah (peace be upon him and his family) said: Allah has prescribed jihad for the men of my nation, and Ghayrat(jealousy about having a co-wife) for the women of my nation. So whoever among them is patient and endures with the intention of seeking reward, Allah will grant her the reward of a martyr.
العدة ، عن البرقي ، عن محمد بن الحسن ، عن يوسف بن حماد ، عمن ذكره ، عن جابر قال: قال أبو جعفر عليه السّلام : "غيرة النساء الحسد و الحسد هو أصل الكفر إن النساء إذا غرن غضبن و إذا غضبن كفرن إلا المسلمات منهن".
The jealousy of women is envy, and envy is the root of disbelief. When women become jealous, they become angry, and when they become angry, they disbelieve, except for the believing women among them."

Of course everyone should know that it's not obligatory for you to give consent and it's better that men understand their wives' emotions and as long as the first wife has not fully given her consent they don't go for the second. because they should not ruin the first life for helping another sister.
All said above are recommendations and not obligations
Wassalam