In diagnosing sexual dysfunction, Bidens's activities with women and children is known as Fetishism.
In most cases, this individual needs a specific object to be sexually aroused.
This is borne out in the multiple photos of Biden----he uses the same technique in most photos.
A sexually dysfunctional person gets sexually fixated on some part of a child or woman's body.
The individual gets sexually aroused by parts of the female body such as feet, hair, breasts or buttocks.
Biden's frequently photoed activities could also be Frotteurism:
The practice of obtaining sexual pleasure by rubbing a part of one's body.....especially genitals.....against another person.
Or by fixating on an object....such a hair.... that serves as sexual stimulation.