A little of what you fancy does you good saying
Originally, it was said euphemistically to express the benefits of having sex. Now, it is used to express the advantages of satisfying other desires as well.
A: I slept all day today B: Yeah, it's totally fine. A little of what you fancy does you good.
I know you are going on a diet, but it's ok to eat fast food every now and then. A little of what you fancy does you good, my friend.
A desire to do something, which is random, sudden and unaccountable
To long for something/ to do something
Believe or act in accordance with your desires, usually in spite of the wants or feelings of others
Used to emphasize one's interest or eagerness to have or do something
This traditional adage was initially made popular by the risqué Victorian vocalist Marie Lloyd, who made it the title of a vaudeville song. Lloyd was a hugely famous music hall performer in England at the end of Queen Victoria's reign and into the early twentieth century, much to the dismay of the moralists of the day, who tried all they could to stop her from appearing. In 1913, she was denied entrance to the United States due to "moral turpitude."
To say the same thing repeatedly
Ok, I get it! You sound like a broken record, seriously!