Not to be confused with edging, a form of orgasm control.
In BDSM, edgeplay is a subjective term for types of sexual play that are considered to be pushing on the edge of the traditional S.S.C. (safe, sane and consensual) creed. They would be considered more RACK (Risk-Aware Consensual Kink).
Edgeplay may involve the risk of serious, even permanent, harm, or death, exemplified by activities such as breathplay (erotic asphyxiation), fire play, knife play, and gunplay, as well as the increased risk of spreading disease, as with cutting, bloodplay, or barebacking.
What constitutes edgeplay varies with the persons involved, and also over time. In the mid-nineties, the Living in Leather convention did not have panels on ageplay or scat because they were considered too edgy. By 2000 they were part of the regular list programming.
Some activities, such as ageplay or rape roleplay, may be considered quite edgy by some and not at all for others. The definition is fairly subjective, although typically based on some level on what people are used to in their local scene.