Imaam al-Ghazaali writes in "Ihyaa `Uloom ad-Deen":

“According to Rasoolullaah صلی اللہ علیہ وسلم the Hurs (Houris) of Paradise will be pure women—free of menstruation, urine, stool, cough and children. The Hoors will sing in Paradise on divine purity and praise—we are most beautiful Hoors and we are for the honored husbands. Rasoolullaah صلی اللہ علیہ وسلم also said that an inmate of Paradise will have the sexual strength of 70 men. Rasoolullaah صلی اللہ علیہ وسلم said, “An inmate of Paradise will have 500 Hoors, 4,000 unmarried women and 8,000 widowed women. Each of them will keep embracing him for the duration of his whole worldly life.” [Ihyaa `Uloom ad-Deen, vol.4, p.430]