it's not as simple, unfortunately. especially now that there's a ton of chemicals in everything we eat, drink and breathe, that have unknown long term effects... for example, it's estimated that more than 200,000 boys have been born as girls in Europe post WWII due to agricultural pesticides used in farming (no link, sorry, it was a recent article).
furthermore, some scary things like the following are just emerging:
http://www.eastandard.net/InsidePage...20into%20girls
Some cosmetics and soap used by pregnant women have the potential to "feminise" male foetuses during the formative stage in the womb.
...
Prof Richard Sharpe, a leading researcher at Britain’s Medical Research Council, says hormone-disrupting chemicals are also linked to soaring rates of birth defects, testicular cancer and falling sperm counts. The chemical cocktails block the male sex hormone testosterone, or mimic the female sex hormone oestrogen.
or:
http://joe.endocrinology-journals.or...tract/36/4/347
Treatment of pregnant rats with an anti-androgen from the 13th day of pregnancy resulted in female organogenesis of the mammary glands, including the formation of nipples in the male foetuses and feminization of other male sexual characters.
i'm afraid we may not be even scratching the surface of the harmful effects of substance X (for any X invented in the industrialized world) on foetuses and newborns.
so, if chernobil in 1986 caused me to be born with an extra arm, should i be denied the operation to get rid of it? (not that TG can be oversimplified like this, of course)