For those of you unaware, the 'Half Plus 7' is an unofficial rule regarding the 'appropriate' age gap between two people when it comes to relationships and sex.

To summarize: Let's say you are 28 and are unsure if you should pursue a girl because she is maybe too young. So divide your age by half, then add 7. You will end up with the age of 21, which is according to this rule the youngest age appropriate to date.

The foundation of this rule is this- For it to work you must be at least 14 and can not have sex with someone younger than 14. The minimum age of someone you can fuck goes up as you grow older but the acceptable age gap between your age and theirs increases.