do my sql homework

you've got an entity called dude
dude likes porn
your task is to find for every dude a second dude whose taste in porn matches the most in percent
the resulting table would look like this:

dude1 dude2 match
    1     2   100%
.
.
.
shit requires some serious thinking
you're not allow to create own tables in the database but you can use as many views as you feel like

what's the input table? if i don't have anything to work from, i can't do much.