Human sexuality and gender expression is a continuum, much in the same way that height and weight are. Not everyone fits into the categories of strictly straight, strictly gay, male or female. Dichotomising sexuality and gender ignores the continuum or clusters of individuals who don’t fall into one of two (and only two) categories and we can fall prey to thinking that one is “normal”. While people may find comfort in the “born this way” argument, looking for a “gay gene” can indicate a level of non-acceptance. If the variation between individuals is collapsed to a binary then the focus becomes on asking why one end of the spectrum exists, when the better question would be to ask how variation in sexuality evolved and came about.