1) Refuse the body scanner and request a manual pat-down.
2) Ask to have a supervisor, or a second TSA staff, present during the pat-down. Explain that this is to ensure that no sexual harassment occurs.
3) If you are a guy, ask to have a female TSA staff member perform the pat-down. If your request is denied, calmly explain to the TSA guy that you are homosexual and that a pat-down by another guy will turn you on and will make you sexually extremely uncomfortable.
4) During the pat-down, make comments such as "Oh yeah, I like it when you touch me there!", or "Can I get a happy ending?"