I have had this "condition" all my life and I can assure you that for a man it is extreamly embarressing and psycologically battering to suffer.
So the solution:
The worst thing you can do is put pressure on your partner, this pressure only makes the issue worse!!!!
Find a way of exploring each other confidence is the trick here there should be no worries or hang ups!
Explain to your man that you do understand and reassure him that whichever way you reach your sexual pleasures it is fine by you!
Lack of arousal is often a cause (not your fault ladies) porn is usually a good way of dealing with this (I know it sounds seedy but it does work) the reason is because whilst porn stimulates arousal it also distracts the male RE sufferer from the job in hand and the subsequent anticipation and performance anxiety causing the problem, therefore releiving the pressure of having to come!
Now I am a sufferer and frankly it has ruined several relationships so please make sure you understand this condition and reassure your partner that you do too! Reasearch! there are plenty of websites out there!
Finally because i'm aware that the ovulation window is short and there is no quick fix to this I will give you the method which I used in order to have my 18 month old!!!
It interests me that one commentator on here suggests that her husband "does his thing" whilst she waits in the bathroom and then subsequently jumps on to catch as much as possible!!! Very bizare for a loving relationship and this must make the poor guy feel totally inadequate, why not therefore incorporate the mastrubation into the session? With my ex partner and the mother to my child I had sex as normal, pleasured her, pulled out and gave myself a helping hand which may last a minute or ten minutes or more and then at the point of no return I would simply put my willy in the correct place and ejaculate, you've had your pleasure, hes had hes and the deed in hand is done, everyones happy!
Now for some blokes this may be a problem having there partner watch them mastrubate, so to illiminate any problems there simply turn round (doggy, spooning) and do it that way, sounds bad, but it eleviates the anxiety!
This worked for me, it hardly impacts on the sexual act because you have had your intimacy and subsequent orgasm, now let him do his bid by whatever means necessary.
Incidently as a long term cure this web site may help: It wont let me post it anyone wanting it let me know!
The key is mutual love and understanding, and reconditioning the penis and mind to accept vaginal stimulation, this cannot be done under any pressure!
Hope this helps ladies any more info let me know!