The same reason he's savagely violent with women and towards LGBTQ(among many other groups). Insecurity.

A complex web of jealousy and desire.

Dementia does tend to weaken one's filter.

Wow. Why would the sexual predator focus so much on peoples bodies...

epstein files distraction, or more curious about it, he might be BI-SEXUAL himself. given how much times he did the hand jerking dance.

Bubba

Small hands. Male fixation. Sounds like Charley’s uncle jack to me

He feels like if he were in better shape he might have a greater chance of fucking Invanka.

Why does the AOTUS like to check out man ass? Oh wait, nevermind I answered my own question.