How can we have prefect sex?

pre·fect   /ˈprifɛkt/ Show Spelled[pree-fekt] Show IPA

-noun1.a person appointed to any of various positions of command, authority, or superintendence, as a chief magistrate in ancient Rome or the chief administrative official of a department of France or Italy.

2.Roman Catholic Church .a.the dean of a Jesuit school or college.

b.a cardinal in charge of a congregation in the Curia Romana.

Based off of this you can either appoint yourself or your significant other in a position of command, authority, or superintendence before hand, or you put a Roman Catholic priest and a little boy in a confession room together.