If a man has two wives, one of whom is ill and the other is healthy, and he does not treat them equally in the bed due to the first one's illness, is this injustice?

Abu Ishaq: All right, our Shaykh, a man is married to two women, and the first woman has an illness or something similar, so he does not treat them equally in the bed because the first one cannot bear it; is this considered injustice to the first one or something like that?

The Shaykh : He should give her the choice; he should give her the choice to either stay with him as you see, or to let her go.
Abu Ishaq: I mean, for example, he does not want to let her go; rather, she lives with him in the same house, and she...

The Shaykh : I understand. If he does not want to let her go, he must treat her and her co-wife equally.
Abu Ishaq: Even if she cannot bear it.

The Shaykh : She knows her own condition better; whether she can bear it or not.
Abu Ishaq: Her husband asked me this question, I mean.

The Shaykh : No problem, but what is meant by her not being able to bear it? If she cannot bear it, she will ask for divorce; if she can bear it, she will not ask for divorce. How is that?
Abu Ishaq: I apologize, I was not able to detail the question. I mean the bed.

The Shaykh : Intercourse.
Abu Ishaq: Intercourse, yes.

The Shaykh : I understand what you are saying.
Abu Ishaq: He spends three nights with her and spends three nights with the second one, for example; so in these three nights, he may not have intercourse with her because she is ill and because she does not bear it by her own will.

The Shaykh : The problem is over, as long as the condition "by her own will" is present, the problem is over.
Abu Ishaq: Ah, yes.

The questioner : My teacher, I mean, is it obligatory to be just between the wives in the night or nights in which he had intercourse with this one, must he have intercourse with this one, or when he feels desire?

The Shaykh : This is not obligatory, but he must not forget her right.