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Au contraire, it is an entirely rational on the part of the woman involved [unless it be in China, in North Korea prison camp or other such place] and on the part of those performing the procedure, sometimes on the part of parents and boyfriends as well. More, as long as it is voluntary and deliberate, it is always rational, as all voluntary and deliberate actions are [rational in the reference framework of the person performing the action].
Irrationality is "I have two [or more] courses of action, A and B. In my opinion, B is better than A, therefore I will do A"]. And such a person has not yet been born, and never will.
If what a person does [as an extreme example, a self-immolation in a public square] appears irrational to you, it does not mean that the immolator was irrational - it merely means that in immolator's perception at the time, the benefits of his action [such as gathering publicity for his cause, or whatever else might be in his/her mind] outweighed the drawbacks you [an outside observer] would perceive - i.e. that his reference [value] frame is, or was at the time, different from yours. And in that reference value frame of his, his action would be entirely rational. As a corollary of this line of thought, all insanity defenses are ipso facto bogus.