As much as I love 
Diesal, and I've also become a sudden fan of Shane in his last scene, but in the world of porn, limp dicks simply mean lack of passion, lack of excitement, completely void and absent of lust in the actor(s) sporting limp dicks.
I was shocked -- and disappointed -- to find both 
Diesal, and Shane completely limp throughout much of this scene!!!  Of all people to be completely limp like this, I really wasn't expecting it from these two.
Hell, even in 
Diesal's earlier scenes when NONE of us would imagine him doing the things he's done with Jimmie in the future, he was even semi hard in those scenes right out of his underwear.
But to see both 
Diesal, and Shane completely limp throughout much of this scene, it was a HUGE disappointment and I am still reeling from the shock!  
I am even more shocked that they bothered to even put this video out for us to watch, considering how much we have all come to love both these guys.  Of course we all have an off day now and again (as these guys both were having on the day of this shoot), but really.  Very bad performance by both 
Diesal, and Shane.  I already rated the scene a 5 after seeing the kissing in the photo set, but if I could re-rate it again after actually watching it, I would be giving it a 2 at best.
To make it worse, the scene ends in a way that I have always loathed, I 
*can not stand it* when an "action" scene ends with each guy simply jacking himself off, as if the other guy doesn't have it in him to even make him cum.  This scene ended with both Shane, and 
Diesal jacking themselves off which I simply cannot tolerate in porn.  I don't even like solo jack off scenes, but I CERTAINLY hate it when an "action" scene ends with the guys having to jack off by themselves in order to finally get their limp dicks to cum.  I would have MUCH rather that 
Diesal didn't waste his amazing kissing on such a piss poor scene.  
HORRIBLE scene, what a shame.  For those of you who love it, I don't know how you can think it's hot to watch guys with limp noodle dicks attempt to pretend they're enjoying each other sexually.  
Abe