Medical reasons, yes I understand. Just because you'd prefer one sex over the other, no I don't agree.
I know of someone in our rather small town who has had two of these procedures done, she had to go overseas, plus the cost of actually doing it, is absolutely astronomical! All because she wanted a couple of girls (she already had some boys). I couldn't help thinking that what if after all that, the pregnancy never progressed to full term..getting pregnant and staying pregnant is so emotional anyway, but to go through all that extra emotional and financial strain, just for a particular sex?