I've since discovered this side-effect isn't uncommon and has a name: PSSD (post-SSRI sexual dysfunction). I know men who also suffer with PSSD and struggle with the same genital numbness and anorgasmia, coupled with erectile dysfunction. 2018 June 8, anonymous author, “My life in sex: ‘After taking antidepressants, my genitals felt numb’”, in The Guardian:
(abbreviation, alt-of, initialism) Initialism of portable SSD.