723 - Indecent Act: 

Most incidents labeled under this category involve "flashing", "streaking" or masturbatory acts.

Canadian Criminal Code:

(1) Every one who wilfully does an indecent act

(a) in a public place in the presence of one or more persons, or

(b) in any place, with intent thereby to insult or offend any person,

is guilty of an offence punishable on summary conviction.

Canadian Criminal Code (a link to: Canadian Criminal Code - http://laws.justice.gc.ca/en/C-46/)