Before you ask this question you should ask yourself another question...
why did God create the sexual relationship between women and men?
the main reason before any thing the sexual relationship is created to keep the humanity offspring by producing a new generation
what we can call the "sexual pleasure" that's derived from the sexual activity is not the supreme purpose ... may be this sexual pleasure as well as the emotional needs as well as fatherhood and motherhood instinct are just like a hidden call to make the relationship between men and women like as a general desire from both ..and this desire can be arranged through "marriage"..so that the life can continue from generation to the next generation depending on this heavenly wisdom that's know exactly how people think and what is their really psychological impetuses
but in the heaven or jannah the matter is different there are no need to keep the humanity from extinction there are no death ... may be for that The God want to give some guarantee to those who believe that the pleasure they have in their first life because of the relationship between men and women will not be perished as well as the nature of paradise will no longer need ""pregnancy and bearing" to produce another generation...no my believed slaves you will have more than any thing you have seen in your first life purified and pious spouses like pearls
In Quran (2:25)
"And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally."
(3:15)
"Say, "Shall I inform you of [something] better than that? For those who fear Allah will be gardens in the presence of their Lord beneath which rivers flow, wherein they abide eternally, and purified spouses and approval from Allah . And Allah is Seeing of [His] servants -"
Look to the word "purified spouses"
(4:57)
"But those who believe and do righteous deeds - We will admit them to gardens beneath which rivers flow, wherein they abide forever. For them therein are purified spouses, and We will admit them to deepening shade."
and it's the same equal for men and for women to guarantee the absolute justice
(48:5)
"[And] that He may admit the believing men and the believing women to gardens beneath which rivers flow to abide therein eternally and remove from them their misdeeds - and ever is that, in the sight of Allah , a great attainment -"
(57:12)
"On the Day you see the believing men and believing women, their light proceeding before them and on their right, [it will be said], "Your good tidings today are [of] gardens beneath which rivers flow, wherein you will abide eternally." That is what is the great attainment."
and when Allah said in the holy Quran(76:19)
"There will circulate among them young boys made eternal. When you see them, you would think them [as beautiful as] scattered pearls."
and said also
(56:22,23)
22:And (there will be) Houris (fair females) with wide, lovely eyes (as wives for the pious)
23:The likenesses of pearls well-protected
he used the same word "pearls"
now the concept of hur al ayn can be more clear ... our Lord create some angels(like as hur al ayn and young boys look like pearls) to serve us in the paradise
I want you to look at the relationship between men and women in paradise by a spiritual view "no debarring(for men who don't have any wife in the first life) and no vulgarization(as some other people pretend to criticism Isalm )"
our residing in the heaven will have some interface between humans and angels
and the concept of relationship between men and hur al ayn will not be as sexual as you think in this life
you shouldn't ask can I have this in the heaven? and in the same time you know that Allah said
But those who believe (in Allah and Islamic Monotheism), and do righteous deeds will be in flowering meadows of the Gardens of (Paradise). They shall have whatsoever they desire from their Lord! (Quran 42:22)
you can do whatever you want just believe in him by your heart and soul