Basically, just hormonal changes as you age and brain development. When trans people get on hormone therapies they often experience sexuality changes on top of the noticeable libido changes.
From what I know, women tend to experience the most in terms of hormone adjustments throughout their life. The constant period cycle has hormones changing every month. Of course pregnancy also changes hormonal make up. The hormones really only cool down after menopause, in which case their sexuality may stabilize the most.
For men it is different because their hormonal changes are more tied to a simple fluctuation in testosterone. They may make more T when their healthier or it may be drop if they get really unhealthy. Age can cause a slow decline in T.
Although, sexual attraction doesnt always change like this. I know many men that have always had the same attraction to their type.
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