Puzzles :)

[W.W]

It has a form, an entrance and an exit, and every time something enters, there is definitely something left.
What is this?

 

[brbicecreamtruck]

a river or a stomach

 

[W.W]

What do a plumber and a cam model have in common?

 

[brbicecreamtruck]

What do a plumber and a cam model have in common?

If you're looking at their ass crack, it is probably expensive.

 

[W.W]

What are these two objects that are put on together to go to bed and taken off in the morning?

 

[brbicecreamtruck]

What are these two objects that are put on together to go to bed and taken off in the morning?

Is the English correct? If yes, I don't know. If no, then my guess is eyelids.