What about latex cyber-skin style pussies, and
blow job mouths, asses that are available. If a man
puts his dick in one of these devices and rubs
inside them, can he get a chemical blister or
maybe a tumor later on ?

Oh, back to rusk mellons. If you make the hole
the right size a melon can produce good suction.
Unless there is a worm inside and it gets inside
your dick.