^ I agree with
@Bullseye73 it would be very weird for them to use a prosthetic penis for something that obviously has no need for it. Keep in mind that prosthetics are usually used when the script calls for the actor to sport an "erection" but without the actor actually having an "erection". This could just be for professional courtesy & modesty's sake between the actors or plainly because the actress is unwilling to appear in a scene with a co-star sporting an erect penis in clear view of the camera because of its "pornographic undertones".
In the case of "Toma" here, I'm perfectly willing to wager that what we saw there is nothing but the actor's socked penis. He could very well be somewhat semi-erect, but that is clearly concealed from clear view.