Knowing your body well has great advantages in detecting illnesses and diseases early, this includes testicular cancer. From jerking off, to shower time, getting to know your balls is one of the best things you can do for your health.
When so many terms are thrown around without meaning and/or context it is hard to understand exactly where the lines are and where they should be drawn. Sexual harassment, assault and rape are all legal terms with separate meanings depending on the actions of the perpetrator and even the specific jurisdiction of the crime. You need to know what they mean and how they effect you and your actions.
Many times we create the exact same conditions that we complain about. If you limit your dating pool by age, race, HIV status and even location and profession (all choices you are able to make), it seems silly to complain about your loneliness.