It is a masseuse's job to loosen up your muscles...not tighten them and make them hard, as Julia does to the guy's cock. When it comes to relieving stress, Julia is great at her job. She jacks the cock. Sucks it. Sits on top of it. Drains her client of all the stress he has built up over a long, hard day at work. So, yes, Julia makes certain muscles harder. But that's because she's a different kind of masseuse.