Are the Houris exclusively for a specific group of Muslims, or for everyone who enters Paradise, and will their share of them be equal, or will it differ according to the believer's rank in Paradise?

Everyone who enters Paradise will be married to the houris (maidens of Paradise), and each will have two wives from among them. As for the martyr, he will have seventy-two wives. Therefore, a Muslim should strive to enter Paradise and attain a high rank therein.