A straight male porn star has to excude "natural" masculinity, have a big peter, and be big-framed (a bigger boy). I don't care about big muscles, etc...all artificial...
No one male stud at the moment stands out to me, that is one who solidly has all three characteristics of the above.
There is some serious poor male talent these days, but if I have to pick:
1) Billy Glyde (got to pumped up and looks a little artificial; but meets the other 2 criterion for sure)
2) Peter North (a stud more of the past, but has all three characteristics going for him, despite his gay porn history).
Whether a stud has made gay porn or not is totally irrelevant. If he makes straight porn and meets all three criterion, he gets my vote as real porn stud.