I foolishly forgot to bookmark a video and now I can't remember where I saw it. (One of those empflix / xhamster type sites.) It's a ballkicking video. The guy is standing up and the camera is behind him, close to the floor, aimed up at his balls, which are hanging through a hold cut in a board, so ...

Apologies if this is a basic question that has been answered several times -- I searched the forum but did not turn anything up.

When a tease instructs you to stroke a certain number of times, or times per second, or along with a metronome, what constitutes a single "stroke"? Is it only an upstroke ...