The bulk update request #8312 has been rejected.
create implication public_nudity -> public_indecency
create implication public_masturbation -> public_indecency
create implication stealth_sex -> public_indecency
create implication exhibitionism -> public_indecency
The public indecency wiki namedrops both public nudity and public masturbation as examples, and stealth sex's wiki describes the act as taking place in "a public indecency situation". Exhibitionism's wiki doesn't name public indecency in its definition, but does reiterate that it necessarily needs to occur in public.
I'm willing to hear counterarguments for any of these, however; this isn't my kink and I don't know much about the fine distinctions.