Muscle porn is just qualitatively different than most porn. It's not really about fucking and sucking. It's about worshiping a perfect body.
Case and point Vin Marco from Manifest Men. He's got an incredible body, but it's not an intense sexual energy. It's sexual, but not about hardcore sex. It's not like I want to fuck him or get fucked by him. I mean his ass is pretty incredible and it would be really hot to get my load deep inside him, but that's not the first thing I think of when I see his pics. What I see is a perfect body that I want to run my hands all over. I want him in bed next to me - cuddling with me. It's about muscle, it's about feeling muscle. It's about being close to muscle. It's about experiencing muscle.
Muscle became popular as a fetish during the AIDS crisis. Back then it was all about looking healthy and strong. And a focus on something other than hardcore sex was "useful". Now that HIV isn't the killer it once was porn is less about muscle these days. But it doesn't mean muscle isn't a beautiful thing to behold, and be next to, and touch... I mean imagine sucking on Vin's nipple. His pecs are so big, so powerful, it's not like sucking the nipple of a regular guy or even a jock.
Bottom line, incredible bodies are incredible and deserve to be worshiped. Start your muscle worship today over at ManifestMen.com - they understand the beauty and allure of a big muscular hunk...