Can Jinn have sex with my wife? Is this hadith authentic?
“When a man has intercourse with his wife and does not name [Allah], the jinn coils around his urethra and has intercourse along with him.."
Here is a source from a islamic website:
http://eshaykh.com/family/can-a-jinn-perform-sex-with-your-wife/
Al-Hakim al-Tirmidhi [in Nawadir al-Usul, Asl 76 and Asl 207] and Ibn Jarir [al-Tabari in his Tafsir (22:248)] narrated that Mujahid said: “When a man has intercourse with his wife and does not name [Allah], the jinn coils around his urethra and has intercourse along with him. That is the meaning of the saying of the Most High: {whom neither man nor jinn has touched before them} (55:56)