I completely agree. It always blows my mind that we consider ourselves even remotely rational as a species when we go against people with different but not-nonconsensual (I personally don't think sex with an inanimate object should be deemed nonconsensual even though the inanimate object does not consent but its obviously not consensual for the same reason) sexual desires.
The only problem with me drilling a hole in, for instance, the wall of a DMV office and inserting my penis into it for gratification should be that there is now a hole in the wall. Anything more than that is the height of irrationality.
So as long as this guy didn't damage the raft I don't see a problem. If he did damage the raft his crime should've been damaging a raft and his punishment should've been having to fix/replace the raft.