About Baoyu's sex, there are only two plots clearly written in the book: dream and mourning, reality and attacking people.
Suggestive, there are "Wang Shui on the table" and Qin Zhong "Be careful to settle accounts with you", which is obviously a hint, but Cao Xueqin did not write it clearly. There's another one that's just rubbing the edge. Jiao Da scolded "foster brother-in-law" after getting drunk, which may refer to Xi 'an and Baoyu, but this possibility is a little small, and Jiao Da is talking nonsense after drinking, which should be nonsense.
As for Daiyu, there is no hint of sex in the book at all.
1, Jia Baoyu
Jia Baoyu is the protagonist in China's classic Dream of Red Mansions. He is the second son of Jia Zheng and Mrs. Wang, the second son of the Goddess, and the reincarnation of the waiter in Shen Ying. Jia Fu is called Mr. Bao. Born of jade, he is the grandson of Jia Fuyu, hence his name Jia Baoyu. Since I was a child, I have been deeply loved by my grandmother Jia Mu, and I live in Jia Mu Hospital. When I was twelve or thirteen years old, I moved into Hongyi Garden in Grand View Garden at the behest of Princess Yuan. He and his cousin Lin Daiyu are soul mates and have developed a rare pure love in the world. But with the deliberate efforts of Jia's parents, he married his cousin Xue Baochai. After a year or two of marriage, he was promoted to a monk and returned to Geng Qingfeng.
The love story of Jia Baoyu, Lin Daiyu and Xue Baochai (marriage of wood and stone, marriage of gold and jade) is one of the three main lines of A Dream of Red Mansions. Jia Baoyu's image has the color of Cao Xueqin's autobiography, but it is essentially an artistic fiction. It is a typical image created by the author consciously, which combines three virtues, good and evil. This is very innovative in the history of world literature.
2. Lin Daiyu
Lin Daiyu is one of the heroines in A Dream of Red Mansions. She is the granddaughter of the old lady Jia Mu, and her name is Pinpin (originally wordless, it was given by Jia Baoyu when Baodai first met). The nickname of Haitang Poetry Society is Princess Xiaoxiang. In the Grand View Garden, I live in Xiaoxiang Pavilion. Daiyu was originally a crimson pearl fairy grass in the dreamland. Thanks to the water dripped by the waiter in Shen Ying, who accompanied her to repay the tears of his life and was transferred to the world. Daiyu's ancestral home is Gusu, and she was born in Yangzhou. She is good at writing poems, all of which are well written and interesting, and she is known as a talented woman. In Gao E's sequel, Lin Daiyu died of depression after Baoyu and Baochai got married. Reddit Zhou believes that Daiyu should be vilified by Aunt Zhao and Jia Huan with tears, but the ending of the original work remains to be analyzed and verified by later generations.