I never understood this argument. For me, we took a vow of for better for worse, in sickness and in health...PPD would fall under that category. You dont cheat in a marriage bc of someone being sick and not being able to perform.
So it is ok if a husband goes out for "companionship" if his wife is too sick to have sex bc of chemo treatments, or a car accident etc.
I just have never understood why if someone in the relationship was sick why this would be ok to stray...
And if the sexual component is that important to you that you cant stay faithful to a spouse who is sick than maybe you need to reevaluate and get out of the marriage, unless somehow your spouse is ok with you getting those needs fulfilled elsewhere.