Macklin's Law 

Macklin's Law is the widely held belief that the pinnacle of sexual activity is not in fact intercourse, but fingering.

He didn't get Macklin's Law last night, he only shagged her.

They were following Macklin's Law in the middle of the dancefloor.

Macklin's Law by floppy blowjobs February 11, 2010

macklin's law 

thou shalt finger

He went home with a girl last night and followed macklin's law.

or

She wouldn't let him have macklin's law, he just got a shag.

macklin's law by disciple of the macklin February 11, 2010