I am writing to inquire into the possibility of having a vasectomy operation. My wife and I have been married for 7 years and now have 7 children, so you can see that we are now desperate. We have tried various methods of contraception, all to no avail.

We were first advised to try the "Rhythm Method" but despite trying everything from a Waltz to a Samba my wife still became pregnant and I nearly suffered a permanent injury while trying the Cha-Cha-Cha.

We were also advised to try the "Safe Period" and, as we were at that time living with my In-laws, the only safe time for intercourse was while they were out. Despite this she again became pregnant.

A "Dutch Cap" was the next suggestion but this again we found unsuccessful and an added disadvantage was that, despite getting the largest size available, my wife found it very tight across the forehead which gave her headaches.

We have also tried the "Sheath" but I had no faith in this from the start despite a demonstration by the Chemist on how to put it on. My wife again became pregnant and I still cannot understand what effect a sheath rolled on the thumb could possibility have to prevent contraception.

The "Pill" also proved useless as it kept falling out until we realized that we were using it wrongly and my wife then held the pill between her knees and this effectively prevented any intercourse at all.

We have tried the "Coil" but found this impossible to use as all the coils are of a left hand thread and my wife is a right hand screw.

"Coitus Interuptus" has been mentioned but we had a very unfortunate experience of this while courting. While performing on the back seat of my car we were interrupted at a most inopportune moment by a patrolling policeman. This resulted in our first pregnancy, preceded by our marriage.

As you can understand we are at the end of our tether and if the vasectomy is unsuccessful we shall have to resort to "Oral" sex, but what enjoyment there can be in just sitting and talking about it I just don't know.

Yours faithfully