Hi,
One thing to consider here is premature ejaculation. For how long has your husband experienced this? Is this a recent condition or has he been experiencing this ever since?
Are there other associated problems like erectile problems or pain in ejaculation?
I suggest that you and your husband seek consult with a sex therapist.This may require further evaluation. Other underlying conditions such as psychological and organic factors have to be excluded. A complete physical examination and a thorough medical history are important in evaluating your husband's case.
For the meantime there is a technique usually done to help delay ejaculation: "the pause technique for the treatment of PE. Masters and Johnson modified this to the pause/squeeze technique in 1970. Patients were advised to cease thrusting or any other penile stimulation at the point at which ejaculation seemed inevitable, forcibly squeeze the glans penis, and then resume activity. The rationale behind this process was to train the man to recognize the typical premonitory sensation immediately preceding ejaculation and, thus, lead to better control."
Source:http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1472672
I have just the opposite problem. I had generally good sensitivity, and began taking Celexa, and anti-depressant, and bammo, I have pretty much lost the much of the sensitivity. Celexa has been used an a desensitizing agent thereby prolonging the opportunity to fininsh so to speak. Talk to your doctor about trying Celexa, its cheap, easy to take, and other than THAT "side effect" it had no other problems for me.