stealth sex
Discreetly engaging in any kind of sex act in the presence of other people, so as to prevent those people from realizing that the act is occurring. When this occurs in a public place, it may be a type of public indecency. Note that not all stealth sex takes place in public (e.g. Danbooru post #1124080).
This tag covers sexual activities other than sexual intercourse, so remember to also use the sex tag where applicable.
Only use this tag for sex acts that involve two or more parties. Use stealth masturbation for solo stealth sex acts.