I can tell you it feels pretty good getting head from an older guy. More patient, trying to get you off instead of himself, knows what feels good, more experiences, etc.
I like sucking guys off while they watch porn. Often I can hear guys cum in the video they are watching at the same time as they spurt their load in my mouth. We both get what we want so no problems.
Str8 guys either need or pretend to need some form of str8 porn to keep them stimulated while they "let" a cocksucker feast on their cocks. My guys ask for porn, then seldom watch it! Maybe trying to reassure themselves or prove it to me that they are still str8 ?