All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
We do not know of any authentic Hadeeth that states that the one who has committed unlawful sexual intercourse in the worldly life will be deprived of marrying hoor in the Hereafter. There are Ahaadeeth to that effect regarding the one who drinks alcohol or wears silk in this worldly life. Ibn ‘Umar reported that the Prophet, sallallaahu ‘alayhi wa sallam, said: "He who drank wine in the world and did not repent would be deprived of it (the pure drink) in the Hereafter." [Al-Bukhari and Muslim]
Abu Sa‘eed reported that the Prophet, sallallaahu ‘alayhi wa sallam, said: "Whoever wears silk in this world shall not wear it in the Hereafter, even if he entered Paradise; the dwellers of Paradise will wear it, except for him." [Saheeh Ibn Hiban and Musnad Abu Daawood At-Tayalisi]
Nevertheless, the Prophet, sallallaahu ‘alayhi wa sallam, said: "He who repents of sin is like the one without sin." [Ibn Maajah; Al-Albani: good]
Hence, the one who sincerely repented of Zina (adultery/fornication) and enters Paradise will be rewarded by marrying Hoor.
Allaah Knows best.