Earthling guys will discuss freely amongst themselves topics that would presumably make even earthling females uncomfortable. Usually to do with things of intimate nature, personal anatomy, and the specifics of work-out regimens.
I don’t either get the last one. I suppose they want us to think it’s natural, like the male equivalent of bottle-blonds who pay a fortune for highlights and lowlights and dye their two year olds to make them look related.
So they don’t. Discuss them in front of females, that is. Planet of origin makes no difference. Unless, of course, they don’t know the female is present, then they get embarrassed when they find out and the Earthling or Alien difference sets the scales of mortification.