Does a man have to ask his wife for permission to observe a voluntary fast as is required of her?

How is the fast of Dawood (peace be upon him) observed, and how can that be reconciled with the prohibition on fasting on Fridays?

He only fasts Ramadan and does not observe any naafil fasts

Fasting more than three days in the month

Voluntary Fasting in Islam

Can You Single Friday for ‘Arafah Fasting?

Combining the fast of Dawood and fasting on Mondays and Thursdays

It is difficult for him to fast and he wants to take some medication to reduce his desire

Combining two intentions in one fast – the issue of overlapping acts of worship

White Day Fasting: Lunar or Solar Calendar?