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"She's a human being and with that comes all the same rights as you or I have to experience normal development and sexual pleasure"
Excuse me? How exactly would you expect her to exercise that right? I'm not sure what the laws are on something like this, but it's pretty clear to me that someone with the mind of a 3-month old would not be able to give consent, not to mention the question of exactly what kind of circumstance would even put her in such a position. Which means that any 'sexual pleasure' she experienced would have to be as a result of rape...
...ok, actually, it just occured to me that I forgot about masturbation. So is this about defending her right to at least experience the small pleasure of masturbating? I might be down with that, but the downside is that it would lead to feelings of frustration, as she would be saddled with a desire that she would never realistically be able to completely fulfill. The issue is certainly complicated, but overall, I don't think the sexual pleasure argument holds up.