I agree with Poseidon: It is not a choice and it is not a lifestyle.
• Transsexuality is about gender, not sex. The "sex" part has to do with our bodies, not the sexual act.
• Gender identity (what gender you see yourself as) is not the same as sexual orientation (who you are attracted to). In fact, they really have very little relation to each other.
• We are born transsexuals (or probably less inflammatory: born with the body of one sex and the brain and soul of the other). It is a naturally-occurring condition, just as previously-stigmatized conditions are: left-handedness, red hair, homosexuality. (I use the word "condition" to mean how we are. I don't know another word to describe it and don't mean this as inflammatory, either.)
- Kate