Are you forgetting this was a MAN. Men don't look at the toilet seat to avoid urinating on it. Why would he bother to look at it before he sat down. Also, the glue may have been white or clear and not noticable. This would probably never happen to a woman in a public restroom. There are only two kinds of women in public restoom (1)squatters, who end up peeing all over the seat and probably down both legs or (2) those who cover the seat with toilet paper before they carefully sit on it (drying it first if a squatter has recently used that toilet).
Your wrong, men do look at toilet seats, especial in public restrooms. There is no way I would ever sit on a wet seat, let alone one with glue on it.
...as a man...
I would never sit on a seat without looking at it. Especially if a potential squatter, squinter or sprayer is sighted leaving the room!
Why would he bother to look at it before he sat down?
Because men don't look at the toilet seat to avoid urinating on it.