Lust awakens as well as the protagonist need to utilize the Jedi Force to stop it. To do this, he will need sexual connections with other women, as well as considering that his body is not efficient in this, he utilizes the Force to boost his sexual energy. Really this is not true. His stamina doesn't boost, he just can use it for other things. The power of a Jedi is the power he utilizes. This is the power that is utilized to alter circumstances that impact his life. In that sense, it is not physical, as it is only the capability to use it in this life, not the capability to produce something out of nothing.