Best evidence regarding the permission of sexual intercourse outside marriage in Hinduism....

According to Hinduism, those who are the prostitutes in this world, will go to the Swarg(Paradise) and serve the dwellers of Swarg as their sexual partners. These prostitutes or harlots will become virgin girls in Paradise and they will be called as "Apsara" as per Hinduism.
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They will be ready to give pleasure and enjoyment specially to those Hindus who have lost their lives on earth in battlefield.
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Devi Bhagavatam 9.1.96-143 says,
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”…those that are sprung from Tamo Guna are recognised as worst and belonging to the unknown families. They are very scurrilous, cheats, ruining their families, fond of their own free ways, quarrelsome and no seconds are found equal to them. **Such women** become **prostitutes in this world and Apsaras in the Heavens**…” Tr. Swami Vijnananda
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In other words Ishwar(God in Hinduism) provides the Dvijas (Brahmins, Kshatriyas, Vaisyas) with numerous prostitutes in heaven. Especially for those who are slain in the battlefield.
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Parashara Smriti 3.28-29 says,
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"**Celestial damsels** seize for themselves, and take delight with the hero, whose body is wounded or cut by arrows, clubs, or maces. **Thousands of celestial damsels**, rush forward in a hurry towards a hero **killed in battle**, each proclaiming, ‘He is my lord, he is mine’.
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Now the point is that, when prostitutes will not go to hell, then surely what they do is not sinful. And permission of prostitutions means permission of any kind of sexual relationship outside marriage.
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For this, we can say, if prostitution is the way to go to paradise according to Hinduism, then there is no problem to do adultery, fornication, homosexuality, incest and other kinds of sexual relationship outside marriage too.
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So, it is very clear that there are full of vulgarity and misguidance in the way of Hinduism.
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"So woe to those who write the "scripture" with their own hands, then say, "This is from Allah," in order to exchange it for a small price. Woe to them for what their hands have written and woe to them for what they earn."
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=> The Noble Quran, 2:79