Luffy and zoro are dating, but they kept it secret for one reason and one reason only.. because the crew didn’t like the idea of a man and a man dating. They thought it was gross and weird and would never happen. So they kept it a secret.. until one day shanks visited their boat while docked at an island. And shanks said he used to have crushes on both men and woman all the time. He started talking and talking about that a man and a man are actually good together.