Will Men Have Intercourse in Paradise?
Question

I'm wondering will the men from amongst the human race that enter paradise, will they have sexual intercourse with the "HOURIS" women in the Paradise.
Praise be to Allah.Blessings in Paradise
Allah has prepared for His believing slaves in Paradise that which no eye has seen, no ear has heard and has never even crossed the minds of men, such that even the person who has the least blessings in Paradise will think that he is the most blessed among them. 
Abu Sa`id Al-Khudri (may Allah be pleased with him) said that the Prophet (peace and blessings of Allah be upon him) said: “The lowest of people in status in Paradise will be a man whose face Allah turns away from the Fire towards Paradise, and shows him a tree giving shade. He will say, `O Lord, bring me closer to that tree so that I may be in its shade… Then he will enter his house [in Paradise] and his two wives from among Al-Hur Al-`Iyn will come in and will say to him, `Praise be to Allah who brought you to life for us and brought us to life for you.’ Then he will say, `No one has been given what I have been given.’” (Narrated by Muslim, 275)
 Among the blessings that Allah has prepared for His slaves are Al-Hur Al-`Iyn . Allah says (interpretation of the meaning):
“So (it will be). And We shall marry them to Hur (fair females) with wide lovely eyes.” [Ad-Dukhan 44:54]
“They will recline (with ease) on thrones arranged in ranks. And We shall marry them to Hoor (fair females) with wide lovely eyes.” [At-Tur 52:20]
 Al-Hur Al-`Iyn are extremely beautiful, such that the marrow of their shins will be visible from beneath their garments. Every man who enters Paradise will have two wives from among Al-hoor Al-`iyn. Allah says, describing them (interpretation of the meaning):
“Therein (Gardens) will be Khayratun-Hisan [fair (wives) good and beautiful];
Then which of the Blessings of your Lord will you both (jinn and men) deny?
Hur (beautiful, fair females) guarded in pavilions;
Then which of the Blessings of your Lord will you both (jinn and men) deny?
With whom no man or jinni has had Tamth [opening their hymens with sexual intercourse] before them.
Then which of the Blessings of your Lord will you both (jinn and men) deny?
Reclining on green cushions and rich beautiful mattresses.” [Ar-Rahman 55:70-76]
 “And (there will be) Hur (fair females) with wide lovely eyes (as wives for Al-Muttaqun – the pious). Like unto preserved pearls.” [Al-Waqi`ah 56:22-23]
It was narrated from Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: “The first group will enter Paradise looking like the moon on the night when it is full, and those who follow them will be like the brightest shining star in the sky. Their hearts will be as one, and there will be no hatred or jealousy among them. Each man will have two wives from among Al-Hur Al-`Iyn , the marrow of whose calves can be seen from beneath the bone and flesh.” (Narratedby Al-Bukhari, no. 3014)
 It was narrated that Anas ibn Malik (may Allah be pleased with him) said: “I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: `Going out and coming back for the sake of Allah is better than this world and all that is in it. And a spot the size of the bow of one of you in Paradise – or a spot the size of his whip – is better than this world and all that is in it. If a woman from among the people of Paradise were to look at the people of this earth, she would light up all that is in between them and fill it with fragrance. The veil on her head is better than this world and all that is in it.’” (Narrated by Al-Bukhari, 2587)
Can you have sex in Jannah?
A man will have intercourse in Paradise with his wives from among Al-Hur Al-`Iyn and his wives from among the people of this world, if they enter Paradise with him. A man will be given the strength of a hundred men to eat, drink, feel desire and have sexual intercourse. 
It was narrated from Anas (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: “The believer in Paradise will be given such and such strength for sexual intercourse.” He was asked, “O Messenger of Allah, will he really be able to do that?” He said, “He will be given the strength of one hundred (men).” (Narrated by At-Tirmidhi, 2459. He said, it is authentic)
 It was narrated from Zayd ibn Arqam (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: “A man among the people of Paradise will be given the strength of a hundred men for eating, drinking, desire and sexual intercourse. A man among the Jews said, `The one who eats or drinks needs to excrete!’ The Messenger of Allah (peace and blessings of Allah be upon him) said to him: `The excretion of any one of them will be in the form of sweat which comes out through his skin, then his stomach will reduce in size again.’” (Narrated by Ahmad, 18509 and Ad-Darimi, 2704)
 The Quran commentators said concerning the phrase “busy in joyful things” (Ya-Sin 36:55 – interpretation of the meaning):
 `Abdullah ibn Mas`ud and Ibn `Abbas (mayAllah be pleased with them both), and Sa`id ibn Al-Musayyib, `Ikrimah, Al-Hasan, Qatadah, Al-A`mash, Sulayman At-Taymi and Al-Awza`i said concerning the verse (interpretation of the meaning),
“Verily, the dwellers of Paradise, that Day, will be busy in joyful things” [Ya-Sin 36:55]
they said, (it means) they will be busy deflowering virgins. Ibn `Abbas (may Allah be pleased with him) said, according to a report narrated from him, that “busy in joyful things” means listening to stringed instruments. Abu Hatim (may Allah have mercy on him) said: he misheard the phrase Iftidad Al-Abkar (deflowering virgins) and thought it was Sama` Al-awtar (listening to stringed instruments). In fact the correct phrase is Iftidaad Al-Abkar (deflowering virgins). (Ibn Kathir, 3/564)
Can you have children in Jannah?
With regard to children, the scholars differed as to whether children would be born as a result of this intercourse or not . Some said that there would be children if the man wants them, but the pregnancy and birth would take just one hour. 
Abu Sa`id Al-Khudri (may Allah be pleased with him) narrated that the Prophet (peace and blessings of Allah be upon him) said: “If the believer wants a child in Paradise, the pregnancy and delivery will take only an hour, then the child will be the age that the man wants.” (Narrated by At-Tirmidhi, 2487; Ad-Darimi, 2712; Ahmad, 11339; Ibn Majah, 4329). And Allah knows best.
We ask Allah to admit us to Paradise and to keep us far away from the Fire. May He bless us with the highest Firdaws, for He is the One Who is Able to do that. Praise be to Allah the Lord of the Worlds.