This is how fish do it.
#fishsexchange . #OpenAccess #fish #SexChange https://www.karger.com/Article/Pdf/526008
"establishing an individual as either a female or a male results not just from two types of gonads but also from coordinated transformations across the entire organism. These require molecular & neuroendocrine networks, & anatomical & behavioural changes. Fish tamed the ins and outs of sex reversal mechanisms to take advantage of changing sex as adaptive strategies."