Story of Vali and Sugriva's birth.

Once upon a time, Brahma was exercising his lingam and ejaculated in his hand. (Ramayana tells his eyes ejaculated). That semen was dropped into Bhumadevi's lap. Thus was born Vriksharaja, a monkey.

One day, Vriksharaja took bath in a waterfall in Meru mountain and turned into a woman. Indra the king of gods and Surya the sun god were going that way and had a threesome with female form of Vriksharaja. They had the devil's threesome, the eiffel tower, where Indra took the tail part (had anal sex) and Surya took the mouth. Sugriva means "beautiful throat".

Thus Vali was born to Vriksharaja and Indira, and Sugriva was born to Vriksharaja and Surya.