Is this Erectile Dysfunction or just nerves?

My Bf and I are are having trouble having sex as he loses his erection whenever we try.
He has no problem masturbating and cums when i give him head, but for intercourse it just doesnt work.
I've told him its just stress and he has to relax, because he's so anxious about it. He's 27, if thats relevant.
I know its not impotence since he can get an erection, but maybe its erectile dysfunction or just pyschological?
He gets so frustrated and i hate seeing him like that.
Thanks :)

a) we use condoms
b) yes he wants to **** me. this is a serious question, if you have nothing useful to say then dont say it
c) he is skinny enough as it is, he doesnt need to lose weight lol

He works too much, between 60-70 hours perweek, sometimes more. I think it is just in his head because it happened once and now he is afraid of it happening again so he is anxious and so of course it happens again, catch 22
I doubt its lack of arousal, we've only been together for 3 months.
I'm more interested in whether its emotional or physical.

maybe he dosent want to screw u

tell him to use condom as some ladies are too hot inside which leads men to go quick -putting on jasmine oil helps too.

it can be either. just because he's 27 doesnt proclude him from having physical problems like low testosterone, nerve damage (often from some sports injury) or blood flow problems. is he overweight? does he have high blood pressure or cholestorhol? could it possibly be diabettes?

it can also be performance anxiety. once a man has this, it is on his mind and fear of it happening can make it happen over and over. it can also be a lack of arrousal if sex becomes routine and it isnt pushing the right buttons.

the bottom line in my opinion is to start by exercising and working out. dropping weight and getting fit improves everything including sex and is just good for overall health. i would also see the doctor so they can verify hormone levels and those things. when all of those were exausted a trip to sex therapist might be called for to help cope with any emotional problem that might be driving this. dont be surprised if getting fit doesnt lead to a complete turn around though. americans as a whole are very unfit, and often adressing general health helps with many issues.

he should be out of that fear, just relax, slowly it will improve.

it probably is just nerves, make sure he really wants to do it orrrr
get really really drunk :)