Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) narrates this statement of the Noble Prophet (peace and blessings be upon him): "Continue to observe modesty, indeed Allah does not shy away from stating the truth; it is not permissible to have intercourse in the back private part of women."
Hadith Referenceسنن الدارقطني / كتاب النكاح / 3750
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 3750، والطحاوي فى ((شرح معاني الآثار)) برقم: 4417، 4418، والطبراني فى ((الأوسط)) برقم: 7722»