Siddhattha overhears these doubts being expressed so he takes of his clothes, spreads his legs and shows the ladies what is there - and what was there is his kosohitavatthaguyha glowing with a golden light. Then a lotus appeared and from its centre a baby boy’s penis emerges which gradually grows into an adult’s. More lotuses appear, each with a bodhisattva in it. The sutra doesn’t record what the ladies-in-waiting said about this extraordinary exhibition
Mahayana can be pretty out there too.
https://sdhammika.blogspot.com/2010/08/strangest-sutra-of-them-all.html>