Well I certainly don't have a problem saying sex in public. Sex sex sex sex sex.
Yet I do use the term gender. This is mainly because people have made a distinction between the terms gender and sex. One being your physical characteristic, the other your self-identified (mental) characteristic. I believe I adopted that terminology specifically after reading a thread on that topic here at EvC.
My problem is that I use it so infrequently I tend to forget which means which.
holmes {in temp decloak from lurker mode}
"What a fool believes he sees, no wise man has the power to reason away." (D.Bros)