I think you got downvoted because some people don't understand what you mean by genetics. They see that and immediately assume you mean it in the way the fatties do when they make an excuse about why they can't lose weight (because of course they only eat one lettuce leaf per day and run all the marathons so genetics must be the reason!!!). Except thigh gaps are actually determined by things like how far apart your legs are set in your pelvis, which is actually something determined by your genes. Some human sized women have thigh gaps super easily, some never will (especially if they have thick thigh muscles). It is really determined by bone structure.