I asked the Messenger of Allah ﷺ: What is lawful for a man to do with his wife when she is menstruating? He replied: What is above the waist-wrapper, but it is better to abstain from it, too. Abu Dawud said: This (tradition) is not strong.
سَأَلْتُ رَسُولَ اللَّهِ ﷺ عَمَّا يَحِلُّ لِلرَّجُلِ مِنَ امْرَأَتِهِ وَهِيَ حَائِضٌ قَالَ فَقَالَ مَا فَوْقَ الإِزَارِ وَالتَّعَفُّفُ عَنْ ذَلِكَ أَفْضَلُ