i watch a lot of porn lol and screenshot things i think are hot or enjoy for any reason. i usually take screenshots of angles i find interesting, cus amateur porno is very good at creative placement of the camera, or ill screenshot a nice clear shot of a hand gripping a body or a nice cock or a new pose etc. then do studies of these screenshots, ill do sketch pages based on em sometimes, or reference them when drawing. i dont usually do a 1-1 copy of a screenshot for an illustration unless i get rly lucky and find something thats like perfect.

for refs of trans men in particular, theres a bunch of trans dudes out there posting rly nice nudes and itll take u all of 2 seconds to find them on twitter. u can treat those pics like theyre figure drawing refs. but use common sense and dont be rude to anyone okay? theres also a limited amount of trans guy vids on popular porn sites but it is slim pickings so i wouldnt rly recommend limiting urself to only looking at trans porn for refs. u can easily look at cishet or cis gay porn and just use your own knowledge of the human body to make art that is accurate to your character.

other general advice is to do a lot of figure drawing so u dont have to rely on references so much and use CSP's (or any other program's) 3d models for pose references.