you feel dirty
One might argue that this is the issue. Men watching porn feel dirty/wrong. Women masturbating and consuming their porn of choice is normalized.
Male sex toys exist, they are just not advertised. (Aside from hole shaped after specific, often fictional, women. Again, the focus is on the woman, not male pleasure.)
Cities which had someone blow a horn to wake everyone up would also have watchmen walking the city at night. Presumably, they would wake the next person up when their shift ended so that someone is awake at all times.