There is an english idiom
As sure as eggs is eggs - meaning certainly no doubt - or something is 100% sure.
I don't know if Richmonds is "playing" on that and not getting my sexual connotation which I assumed he was alluding to as he used the variable SEX. - or maybe I have an overactive Hypothalamus .....
For all the non native speakers of the Queens English.
There is a sort of not said understanding that Sex can be about 3 Minutes - just about enough time to boil an egg.
Is that clear enough?
Maybe this will help
https://www.reddit.com/r/Jokes/comments ... preparing/
Oh and for any prudes - I am willing to post links to Java sites - you have been warned!!
Kindest Regards Lagi