Since 1965, Dr Jonas is helping parents choose the gender of their baby.

On the Jonas method's official website, besides the articles about infertility, contraception and gender selection, there are numerous testimonials of his gender method effectiveness.

For those that suffer from genetic disease running in the family, affecting only one gender, Dr Jonas has a specially dedicated advice to prevent genetic abnormalities as much as possible.

It is interesting to note that Dr Jonas does not believe in "gender diet", that is to say, following certain dietary guidelines to upper your chances of conceiving a specific gender.

As is the case with this blog, he has raised his concerns about douching method, i.e. vaginal baths with acidic or alkaline solutions used in hope of making woman's vaginal environment more "boy sperm" or "girl sperm" friendly.

It seems Dr Jonas is not the fan of the rhythm method either, because the menstrual cycles and ovarian cycles are not really one and the same. So, you can throw out your basal thermometers!

Dr. Jonas has discovered that under certain circumstances the bio-chemical environment of the endometrium is subject to certain periodic variations and that these in turn lead to sedimentation of the sperm.

Dr Jonas gender selection method teaches that there are some days in woman's fertility cycle where she can conceive a boy only, and days where only a girl can be conceived. These days are completely personalized and depend on data completeness for accuracy.

This is the only gender selection method that I know of that can pinpoint the gender for not only the next pregnancy, but for the two or more subsequent pregnancies.

In their words:

"This allows couples without children to plan their TWO future children's gender in advance. You can pre-select the first child's gender, and at the selection of the first child's gender, you can also can plan the gender of your second child or subsequent children." Dr Jonas fertility calender shows the gender of the baby next to the red marked days. There may be rare cases where instead of boy or girl, only a horizontal line will be shown. This means that it is very difficult to determine the gender with certainty and therefore they recommend opting for the subsequent terms.

All you have to do in order to conceive the gender you desire, is to have intercourse one day before, or two days after, the red colored day. Therefore, if you want to conceive a boy, you will plan intercourse around those red dates that show a boy gender.

Two caveats: after the verified pregnancy, unprotected sexual intercourse should still be avoided, especially on red dates because it is possible for additional conception to occur, and yes, it is possible to conceive when menstruating too. All pregnancies are counted in Jonas method fertility calendar.

"Effectiveness rate of 97.7%..."(P<0.023), 2.2 in the Pearl Index (Jonas, Rechnitz et all, 1970)Centre Jonas International Research Corp. is based in Australia, with representative offices in Japan and Russia.

What they offer is a personal fertility program, the natural (drug-free) way - for a fee of AUD$250.00 - which is, as they accentuate on the website, less than a one-time visit to a fertility specialist.

The program is valid for one year and includes custom made high fertility days. If you do not conceive in that time frame, they offer a free additional program for the following year.

They assure the perspective customers that personalized support and advice are included in the program fee.

Results will be sent by e-mail and you may also request printed material by mail.

Dr.Eugen Jonas Method® - Natural Conception Control™ is protected by the World Intellectual Property Organization (WIPO), Geneva, Switzerland, NO.713239.