Consent "with a possible discussion of rape culture" must also be discussed along with sex with both genders, periods, sexually transmitted infections, contraception and protection, pregnancy, an explanation of pregnancy and "other gender types — transgender, non-binary etc".
"Like most parents, we were hoping we would have more time before this became a problem; ideally, I'd avoid it altogether!" the mother wrote.
"But we're at the point now where they aren't satisfied with the answer we're giving them.
"My husband and I are willing to pay £2500 ($4463) to the right candidate who can handle this delicately and professionally."
All sessions will take place while either one or both parents are home "so the children can come and find us if it's getting too much for them", although the parents will not sit in on the lessons.
The successful candidate must have background checks and experience in a similar role "would be favourable".
It's not the first time the Childcare.co.uk parenting website has attracted unusual job ads.
In October last year, a couple posted an ad for an "open-minded" nanny to care for their gender neutral kids.
The English family specified that the children, aged six and two, could not be given nicknames or be allowed to play with gender-specific toys in line with their parenting style.