So, because Body Integrity Identity Disorder is often brought up here, mainly to show how society draws the line of amputating your limbs, but not for chopping off healthy breasts and genitals, I decided to look more into it, and to see if it really does compare to gender dysphoria.
Interestingly enough, it is noted that most people who have BIID are predominately male, and most of these men are also diagnosed with another paraphilia. Also interesting, is that one of the first psychologists who studied it, and described BIID as being primarily sexually oriented (eg, a fetish), was none other than John Money. Also, most of those who have BIID, only want to amputate their non dominant side (so if you're right handed, you'd want to amputate your left side limbs, and vice versa). It appears that the left leg is the most common limb that people with BIID want to amputate.
Now, we've only heard about people wanting to amputate their limbs, but BIID is not just related to the limbs. Some of those who suffer from it don't want amputation, but instead want to paralyzed, blinded, or deaf, or otherwise permanently disabled, but those aren't as well known as the ones who want amputation.
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And here is a comment on a different site of just how those with BIID think:
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A lot of articles also try to state the sufferers aren't delusional, and it's a neurological disorder. Some say it's psychological, but also neurological. CBT and antidepressants seem to help somewhat, but so far, there is no cure. And obviously, the medical field is extremely wary of doing actual amputations or otherwise disable these people (such as blinding them or paralyzing them), though in the few cases where doctors did go ahead and do this, it does seem they are extremely happy with it. And like this bloke above, some will even resort to doing self amputations, or injure themselves in a way where the doctor has to perform an amputation.
Anway, didn't mean to derail, just thought this would be interesting to add, and the noted similarities it has with gender dysphoria, basically, an extreme distress of their natural body, and this starts in childhood. The biggest discussion on how to treat this disorder is basically, are they sane and doing this will actually help, or are we just needlessly disabling mentally ill people for life?