I agree with Oneaday.
There's a reason that experienced working girls know about all the accelerator pedals to press in order to hurry a punter on his way to orgasm, such as anal stimulation, hand (with no condom, rather than mouth or pussy with condom) stimulation, and so on. The reason is that your problem is pretty darned common. Whether the causes are physical or mental is unknowable for a while, until you see whether the symptoms persist. But if you punt long enough, it will likely happen to you.
I wouldn't worry too much, but the question is, what to do now?
I'd suggest take a rest for a couple days, get lots of sleep, don't be drunk or on medication (unless prescribed), and then jump back on the horse with one of your all time favorites, someone you're very familiar with, someone who makes you feel very relaxed. I think it would be a mistake to say "well, instead, let's try this brand new girl, who's ultra sexy with good reviews, to put little brother to the test". Trust me, you don't need that kind of pressure. Just the opposite. You need a non-pressure punt.
Gherk | |