If you consider something like a plastic sex toy, there is no gene connected to the desire for plastic sex organs. Plastic is much newer than genes and genes evolve slowly. This choice is part of something that is much more general and much less direct. Calling this natural and genetic how this is being deliberately misrepresented.
The way this really works is sex is pleasurable and pleasure is hard wired into the brain. Pleasure is used as the carrot on the string for various instinctive needs such as eating and procreation. If you add to this base desire for pleasure, a little imagination and some reverse engineering, you can still have an orgasm with plastic toys. This is all about pleasure and reverse engineering, and not about direct genes and instinctive wiring for plastic toys.
If you someone decided to live the lifestyle of a motorcycle gang member, this is not genetic at birth, since genes are much older than motorcycles. What really comes to play is need for social acceptance and prestige among a group, but in a way that also makes one feel self esteem and safe. One has these composite needs, and after looking around, they reverse engineer what is needed to meets these general criteria.
Sexual identity, which is new and expanding since Obama, is the same thing as the motor cycle gang member lifestyle. It is being influenced by left wing culture and media funneling options to get a collective result. Uniqueness is also hardwired into humans, which explains why the numbers of sexes is expanding.
This has to do with will power and choice based on a range of underlying human needs, that are independent of the mask that is chosen. You could use other masks, and may well change the inference mask, in the future. It is not healthy for science to become part of the problem; money making, by calking it hardwired.