"Peak" refers to the highest point or the topmost part of something, such as a mountain or a performance. It can also describe the ultimate level or the most intense state of something. Full definition
Due to the huge amount of torque that stays constant at peak at all times, this single - speed transmission more than gets the job done. (motorbeam.com)
When the sex stamina of men goes down with every passing day at the same time women reaches at peak in this regard. (cougardatingsites.org)