One of those times you’re “bonding” and you’re at a bar or restaurant or taking a walk, or hanging out after shooting some hoops, or whatever you do, just seize the bull by the horns: “Dad, can I ask you a question?” “Sure son.” “Well it’s a little awkward… about life and everything….” “You can ask me anything, Zack.” “I’m not asking about the birds and the bees. I know about that. See, it’s about this girl… did you ever have a situation where….?” And you’re off. He might be a bit awkward, and then he might talk. On the other hand, he might be terribly uncomfortable, and then, well, I’m afraid you’re out of luck. But if he was a hippie (whatever that means), he’ll probably think it’s cool, and will answer as best he can, and he won’t be condescending, or make stupid jokes. He’s probably been waiting for that father-son talk a long time, anyway.