i don't like sex either, i don't like someone being that close to me
perhaps they're thinking it might help with the problems you're currently having and if you mentioned your dislike of sex perhaps they assumed you were thinking of that as a problem as well
maybe if it's not a recent thing (has it been going on since before your child was born?) you should let them know so they can differentiate it from any newer "symptoms" that have arisen that they're suggesting be helped with antipsychotics