Is it permissible for married couples to have sex during Ramadhaan for some might find it very difficult to abstain?

Question

Intercourse during the day in Ramadhaan is prohibited for men and women. Doing that is a sin for which expiation (Kafaarah) must be offered. The Kafaarah is to free a slave; if that is not possible then the person must fast for two consecutive months; whoever is not able to do that must feed sixty poor persons. With regard to intercourse during the night in Ramadhaan, this is permitted and is not forbidden, and the time when it is permitted lasts until the onset of dawn. When dawn comes, intercourse becomes forbidden.