One thing I have noticed about transexuals in Japan and South Korea is that there is a percentage of them that decide to have their testicals removed (castration). Sometimes they will get prosthetic testicals, but many times they will not.
Fuuka Hanasaki is an example of this.
Castration reduces the growth of body hair and probably reduces the need for female hormones. I'm thinking this is more effective the younger they are when they have the procedure, say 18-20. They maintain the ability to get erect, but do not produce sperm, and they ejaculate only semen.
I have never met a Thai LB that has had this done, I wonder why it isn't more common in Thailand?