When asked at terminal C at IAH last week I told him because I might be pregnant. I got a look of stunned incomprehension as I am obviously male. I explained that for the last few months by belly has been growing and so have my moobs. He actually started laughing and said "that could be true for most of the guys that work here" and asked me to point out my belongings. No further questions and a very light touch on the grope.