I am afraid what your daughters might not be considering is the impact of puberty. Taking hormones post puberty to suppress gender traits does not undo the muscle growth and bone density advantages of having gone through puberty with teenage boy doses of testosterone in your system. There may be some loss of physical advantages with hormone therapy but the genetic advantages for the most part are baked in at that point.
Does anyone really think a year of estrogen injections is going to level the playing field for these athletes?
