answer:Good question. This happens regularly in theaters, airplanes, and so on. I’ve always presented my butt in these situations. I figured that 100% of all people have butts, while only 50% of people have the same crotch I do, and therefore there is likely to me more common understanding among all genders if they see a butt pass their way. Further, if the butt happens to brush against them, that’s less overtly sexual and perhaps threatening than if my male package happened to. All of that said, however, it’s a non-issue – most people just sort of accept that on a plane or in a theater, things are not going to be comfortable at all times.