Erectile Dysfunction..?

My bf has problems keeping his erection during sex, he gets erections easily but during sex he either cums very quickly or just loses them very quickly, espicially when im on top, why does this happen??

When your younger, the more excited a man gets, like when you're on top perhaps, the sooner he will ejaculate.

There is a lot of good advice on Premature ejaculation under my source.

I have ED but that is because I'm 65 and a recovered alcoholic, so I have to use Viagra, you could consider this also, the only problem is that you can only get the genuine product with a doctor's private prescription.

Only use the genuine prduct there are a lot of fakes about.

Maybe he needs to relax. Ever try some relaxing herbal teas?

Try different positions, take it slow, and tell him to pull out before he comes so he can carry on.

Nerves, most likely. He needs to learn to be more comfortable around you in the bedroom-- it sounds corny but you can "encourage him" (Fake it.) to build up his confidence, and over time he'll stick around.

if you can reach it,just before he comes,press on the soft spot just behind his balls;if done properly that will prevent him from ejeculating (mispelled,i'm sure) and might keep him going

maybe your vagina is too big for his penis. or you should try co*K rings.

maybe he's gay, ands not really into you...or just not when he has to see your face

There are quite a few reasons for this, your boy friend should go to his doctor to make sure that there is not a medical reason. If your boy friend is taking medication for high blood pressure, angina etc this can cause these symptoms.
If that is the case then the doctor may prescribe Viagra.

Try masturbating your boy friend until he ejaculates and see if he maintains his erection while you are doing this.
I t may be he is worrying about not maintaining his erection when having intercourse and this will be the cause a loss of erection, how ever he should see his doctor to rule out any medical problem.