When the wife is niddah, a couple may not sit together on a seat where the movement of one person can be felt by the other. This could apply to sitting together on a couch. But it is not the case for a sturdy sectional couch if they are on different sections. Therefore, a couple may sit on the same couch if it is sectional, or if it has separate pillows along the seating surface, as long as the couple is not sitting close enough to touch.

It is possible that sitting on even a sectional couch togther would be considered too cozy for some - it depends on what the couple is doing. If husband and wife are sitting with a group of people, there should be no problem. If they are home alone in front of the fireplace with romantic music, then sitting together on the couch would be a concern. Therefore, during niddah times, it may or may not be appropriate to sit together on a sectional couch, depending on the context. The couple should use common sense in each situation.