The houris (; from Persian: حُـورِی, ḥūrī; plural of ḥaurāʾ or ḥūrīyah; Arabic: حُـورِيَّـة) are beings in Islamic religion, described in English translations as "and splendid companions of equal age [or well-matched]", "lovely eyed", of "modest gaze" and virgins who will accompany the faithful in Jannah (Muslim paradise).
People in Paradise may have whatever they like.
"They may have whatever they wish there [in Paradise], and with Us is more" (Qur'an 50:35).
My understanding of this (from theory, obviously not from experience!) is that life there is similar to life in our dreams, in that, sometimes, when you are dreaming, if you imagine something strongly, you can make it appear. Similarly, I am given to understand that, in Paradise, the human being will be able to "wish" into existence whatever they want.
Pious men will be getting their pious wives with them in Paradise but in a completely different shape. Allah (SWT) will make their wives in the best shape that they can not even imagine in this life. The pious wife will be more pretty than any Houri.
Pious women who did not have pious husbands in this life will be granted pious husbands in the Paradise.