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.
When talking about being "out at work", the first assumption is that many of us, and our brothers, have a choice. From the tropes about the gay lisp, voice, face, walk, to the expectations of gay male effeminacy, mannerisms and every other conceivable homosexual stereotype, the decision to be open about our sexual orientation is not always under our control.
The United States and the United Kingdom have done research into how often gay males actually are tested for HIV within a year and general STATS on HIV infection. These are surveys from willing participants and cannot hold the full story about our entire community, but they do paint a chilling picture.