I can't find anything about permanent side effects of SSRIs
https://en.wikipedia.org/wiki/Selective_serotonin_reuptake_i...
Additional potential long-term side effects include, but are not limited to, weight gain, feeling emotionally numb, and an increased suicided risk. Furthermore, there's the SSRI discontinuation syndrome: https://en.wikipedia.org/wiki/Antidepressant_discontinuation...
SSRIs are truly fun stuff.
It's theorized that the suicide risk from most anti-depressants are from transitioning from so depressed that you have no motivation to do anything, to having enough motivation, but still feeling the related pain from depression.
Likewise with weight-gain. For many depressed people they have a suppression of appetite, and relieving the depression causes return of appetite.
AFAIK, neither the sexual side effects nor the withdraw symptoms are generally considered to be long term much less permanent.
They’re often not permanent, but particularly with sexual problems there is a significant minority of people who do not get better after they stop the drugs. The term to search for is “PSSD” (post-SSRI sexual dysfunction).