I have gotten it to work when I have assisted, so I know what works for me. Sure, it will be different for every guy, for physical and mental reasons, just like it is different getting off every girl. Since I am not the bossy type and way too sensitive to how my partner feels, I usually just fake it when she isn't doing it right (for me). But when you are with someone for long enough, you try and work together to figure out how best to
take care of each other. I keep ending up with non-compatible sexual partners…usually lazy, selfish, over confident in their technique(s), not open to suggestions/hints, and lacking in the ability to experiment. I call them the “Wam-Bam-Thank-You-Mams”! All they want is insertion of penis into vagina.
Personally, I am very attentive and pay attention to the little signs as well as more direct ones. Plus, I will straight out ask what, where, when, how, with, etc.? I'm an Aspie in all other social situations, but not when I am intimate with a partner. I’ve been told I am not even the same person. I also always make sure the girl is taken care of first. This is due in part to this great sense of duty I feel to any girl that will actually give me the honor of fornicating with me.
I don’t disagree with what you are saying, but I know what I like and have been very clear, even showing by demonstration and video, what will work. When they still won’t do it properly, and continue to claim how good they are at it, which in and of itself is such a turn off, I just…oooh. Now I am upset!