In certain Ayahs of Qur'an, it is mentioned that Allah gifts a wonderful Gelman to a good man in heaven. I'm not that familiar with arabic language, but as my best of knowledge Gelman, means a (servant/slave) beautiful boy. In that case why should God advertise a Gelman in heaven? Is gay encouraged in heaven?
e.g Take a look at Tur, Ayah 24.
وَ يَطُوفُ عَلَيْهِمْ غِلْمانٌ لَهُمْ کَأَنَّهُمْ لُؤْلُؤٌ مَکْنُونٌ
There will circulate among them [servant] boys [especially] for them, as if they were pearls well-protected.
Note that "هِمْ" is for male, that means "them" is about male not female. The above translation is taken from here.