"Um...in the way you define gender...both, kinda. When you are born you are what you would call a spring or an autumn, but my planet's year is about twice your earth year, so spring begins one year autumn is another. Springs have six different mating cycles, and so do autumns, but a given person will only go into heat one of these twelve seasons...we can number them one to twelve, lets suppose your cycle started at 1, you would go into heat and get pregnant or not. This is when your estrogen would be the highest. It drops and testosterone raises until sixth cycle when you are most masculine. We can only get pregnant during our cycle, but our "male" parts are always active but become impotent during our cycle or when with child." she paused a moment to breathe "If you were born season 1-6 you would be a spring, and 7-12 you would be an autumn, make sense?"