Trefoil tag

http://miezaru.donmai.us/post?tags=trefoil&commit=Search

For when the panties, shaped by the buttocks and the mons pubis, create a distinct three leaf clover shape. Notice that if the material stretches straight across between the two buttocks, that's not really a trefoil. You need the indentation between them. Yes, it makes a difference!

What you should do here is click the "?" next to trefoil in the tag list and create a wiki entry.