You just need to do some stretching and expose the head to touch more so that it becomes a little less sensitive.
Here's an extract from my stretching instructions. Click on the first link below for all the information you need.
"WHY BOTHER TO STRETCH
Although some men manage to have reasonably normal sex lives with phimosis there are some disadvantages to having a non-retractable foreskin.
Firstly it is hard to clean and may smell. The body produces a natural, white, cheesy substance called smegma that collects under the foreskin and in the folds of female genitalia. Smegma is a natural lubricant and usually does no harm. But it is susceptible to infections that can cause pain and/or odours. This can be a real turn off for a sexual partner. Infections can also cause pain and eventually scarring of the foreskin.
Secondly having sex with the foreskin forward reduces sexual sensations, especially when wearing a condom as well.
Thirdly many men with tight foreskins complain that sex without a condom is painful as the foreskin may be forced back during sex causing painful over-stretching of the foreskin opening.
BETAMETHASONE
You can ask your doctor to prescribe Betamethasone 0.1% or 0.05% ointment. A tiny amount of this ointment can be applied to the tight part of the foreskin, ie. the opening of the foreskin when it is in the forward position. It will speed up the stretching process but won’t do anything on its own, without the stretching exercises. Stretching will still work without the ointment, just more slowly.
STRETCHING TECHNIQUE ONE
If the foreskin is very tight the simplest method is to pull back on the skin (easiest with an erection) so that the opening feels tight and a bit uncomfortable without real pain. Hold that for a few minutes and repeat a few times. Do this a couple of times a day. You will find that soaking in a warm bath will make the skin softer and easier to stretch.
The major disadvantage with this method occurs when some stretching has been achieved or if the phimosis was mild to begin with. Once the opening is big enough to just fit over the rim of the glans when erect the foreskin is at risk of getting stuck behind it. If this happens a condition know as paraphimosis may develop.
This is why stretching technique two is probably better once the foreskin opening is big enough to make it almost possible to slide the foreskin back over the glans.
PROBLEMS?
If the opening becomes sore, or develops splits, stop for a few days and let things heal up. Going at it too fast will only slow things down in the end. Sometimes splits and tightness are due to a fungal or yeast (thrush) infection. Treatment with an antifungal / anti-yeast cream designed for women’s genitals will usually fix this problem. I’ve also seen reports of success with a Hydrocortisone / anti-fungicide mix like “Fungocort”.
PARAPHIMOSIS
Paraphimosis occurs when the foreskin gets stuck behind the glans of an erect penis, trapping the blood that causes the erection in the glans and causing swelling of the foreskin itself. If the foreskin becomes stuck squeeze the head of the penis firmly to force the blood out and try and ease the foreskin forward. Perhaps soaking in the bath or using an oil-based lotion will make this easier. If after many tries you still can’t do this see a doctor or go to a hospital emergency room fast. This is not a common problem but you should be warned of the danger.
STRETCHING TECHNIQUE TWO
The second stretching technique can be best illustrated by this photograph http://www.foreskin.org/46-33-03.jpg. You can either grab each side of the foreskin opening and gently pull on each side of the opening, as shown in the photograph or, even better, insert the ends of two fingers, even the little fingers and pull them gently apart. Stretch the opening in this way until it feels uncomfortably stretched but not actually painful. Hold and repeat as for method one. Once again this is best done after soaking in a warm bath.
SENSITIVITY
As you stretch and are able to expose more of the glans you may find that it is very sensitive or even painful to touch. You will find it less painful the more you expose and use it and gradually the over-sensitivity will lessen, until all you feel is pleasure. A gentle way to start touching the head is by using the shower spray. Also use water-based lubricant when touching the head directly and this should be more comfortable.
SMEGMA BUILD UP
As you stretch and are able to expose more of the head you may discover a build up of smegma. This may even contain hard lumps that are hard to remove. Soften them with a light vegetable oil or a non-scented, oily cream such as sorbolene or vitamin E cream. The smegma and softening agent can then be removed with a mild non-scented soap followed by a thorough rinse with plain water. A number of applications over a period of time may be necessary before the build up is cleaned away. Once it is then simple rinsing with plain water every day is enough to keep most penises clean and fresh. Some men can use soap daily but others find it upsets the natural balance and can actually cause infections or irritation."