What's the deal with the numbers on reviews?

[dynamic]

Hi, sorry if this is a stupid question! What's the deal with numbers on reviews? I'll often see people using 4 digit numbers to refer to ladies, but I don't know what that refers to. Any help for a newbie appreciated

 

[Kenshiro2029]

Hi, sorry if this is a stupid question! What's the deal with numbers on reviews? I'll often see people using 4 digit numbers to refer to ladies, but I don't know what that refers to. Any help for a newbie appreciated

Last digits of phone numbers listed in Leo and other sites

 

[dynamic]

Thanks!