Not graded
Sunan ad-Darimi 1111
أَخْبَرَنَا خَلِيفَةُ حَدَّثَنَا عَبْدُ الْوَهَّابِ عَنْ عَوْفٍ عَنْ الْحَسَنِ قَالَ كَيْفَ شِئْتَ يَعْنِي إِتْيَانَهَا فِي الْفَرْجِ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 1111).