6 - 8 months. I wouldn't have sex with him for at least 3 - 5 months. I have trust issues and I need to learn more about the guy before I can trust him. I'm also not a fan of promiscuity. I see it as a test. Though it depends on the guy. 1 - 2 months are enough when I don't want a "serious" relationship with him and where I know that the relationship won't last. It's a good opportunity to grow and learn more about relationships.