I'm a bit unusual on this topic! I'm 67 years old now. When I was teen though, I would have given my eye teeth to have sex with my dad!!! But now, I would never in a million years have sex with my own son, even if he was a willing participant! Have no idea why, either! So the thought of being a son having sex with his dad is hot to me, benot the other way around. And yet, for anyone else, if both men want it, go for it!!
My dad and I only did some minor playing, and only twice in my life. We had a "sword fight" with our hard cocks once, and one time we jacked each other off. Both of those were so amazing. One other time, when he had been drinking, I really thought he wanted to suck me, but I chickened out!! What an idiot!!! I sooooo wanted to 69 with him! If I had let him suck me, I know that would have given me the courage to suck him too! Oh well. He's gone now, so too late!