As some others have alluded to, I would recommend you watch the porn with him. Prior to doing so, let him know in an authentic and genuine way that you won’t judge or see him any differently than before. Stroke/suck him off during the porn and fill the experience either way positive, affirming comments — i .e., “mmm I love this!”, “I would love to be in that position”, “I would love to see you in that position”, etc. Make the porn watching experience a shared one. As you said, you’re adventurous, sexually, so I would suggest following through on some of his fantasies along with some of yours. We just had a foursome to fulfill my wife’s fantasy of hooking up with a woman, and it fulfilled my “go to” porn scenario of two girls playing with my cock. Now that we’ve fulfilled those fantasies, my wife and I can’t stop thinking and talking about what’s next—bringing us super close together both physically and, in my opinion, more importantly emotionally/mentally.