If you are having early ejaculation due to sensitivity you may consider applying Lidocaine gel before sexual activity. This helps to desensitize the area allowing the erection to last longer. This is by prescription and you will need to discuss with your doctor about it.
SSRI's are used to treat premature ejaculation as well. Such as Zoloft, Celexa, Paxil. These also need to be discussed with your provider.
The Vacurect may also provide too much stimulation and not prevent early ejactulation. But it is effective for obtaining and erection.