Is it possible for sexual intercourse to occur between jinn and humans in the manner described, where the jinn removes the husband from his wife and has intercourse with her, and can the husband be unaware of what is happening?

Magic is a reality and has an effect on the bewitched, by Allah's decree and destiny. It may cause separation between spouses and may prevent one of them from intercourse. What afflicts a person may be magic or jinn possession, as some scholars have mentioned that devils assault humans, fall in love with them, and share men in their women, citing Allah's saying: "And incite [to disobedience] whoever you can among them with your voice and assault them with your cavalry and infantry and share with them in [their] wealth and [their] children and promise them." But Satan does not promise them except delusion. It is recommended to seek protection from devils by means of Ruqyah (Islamic exorcism), by consistently reciting morning and evening remembrances (adhkar), by maintaining purity, and by observing the required etiquette during intercourse, such as saying "Bismillah" (in the name of Allah) before intercourse, as the Prophet (peace be upon him) said: "If anyone of you, when he comes to his wife, says: 'Bismillah, O Allah, keep us away from Satan, and keep Satan away from what You have bestowed upon us,' and if a child is destined for them, Satan will never harm it."