Vince is undiagnosed, but I am proposing two provisional Y-code DSM 5 TR diagnosis; leaning towards #1:
1) Other Specified Paraphilic Disorder, Coprophilia (which is the use of feces for sexual excitement)- if coprophilia causes significant distress or impairment to the individual, or if it involves harm or risk of harm to others and does not fit into the other specifically named paraphilic disorders, it would be classified as such.
2) Elimination disorder, Encopresis- This involves repeated passage of feces into inappropriate places. Like enuresis, this behavior must occur at least once a month for at least three months and cause significant distress or impairment in important areas of functioning. Encopresis is often involuntary, and it may or may not be associated with constipation and overflow incontinence.