Negotiation
Before addressing the elements included in the acronym below, start negotiations by affirming what you are interested in, and what you want to do. Be conscious to use an "opt-in" approach that lists only things that are okay to incorporate into the scene; anything not listed is not okay to engage with during play. In contrast, an "opt-out" approach would list only things that are not okay to incorporate into the scene. Once you have that baseline established, then move on to the elements in this acronym:
S.M.A.S.H.T.
- Safety/Safewords
- Medical/Marks
- Aftercare
- Soft limits
- Hard limits
- Triggers
Safety/Safewords
Establish safewords, and make sure to include both verbal and nonverbal ones, especially if there might be some kind of gag or other reason someone may not be able to speak during all or part of the scene. Define exactly what happens when a safeword is called; for example, does "red" (which many people use to call an immediate and full stop to all activities) mean "back away and don't touch" or "immediately offer physical comfort"? Also, if there are any safety concerns or considerations surrounding the type of play you are engaging in, this is a good time to bring them up. What is your risk profile? Is it relevant to the type of play you are going to be engaging in?
Medical/Marks
Is it alright if the play you are engaging in leaves marks? What if it is impact play that could potentially lead to bleeding? Is it okay if the play continues to that point? Do you have any medical issues that could affect the type of play you are going to be engaging in? You do not need to provide a complete medical history, but if you have a joint that bothers you if you stay still for too long, or if you get dizzy and faint if your blood sugar is low, or if you have allergies or asthma, or a pacemaker or something of that nature, it is important to discuss that with your play partner(s).
Aftercare
Aftercare varies drastically from person to person, and is a vitally important consideration for both the bottom and the top. Some people enjoy physical touch after the scene is over, some people want to be left alone. Many people just need a quick snack or a drink of water. Aftercare can extend beyond the immediate post-scene time to include a check-in the following day, or days thereafter. Whatever the preferences, establishing everyone's boundaries and desires regarding aftercare before the scene begins is a very important part of negotiation.
Soft Limits
In this context, soft limits refer to limits or boundaries that participants have concerns about, but may be willing to try and push beyond. These can include activities that a bottom does not like but is willing to engage in for the sake of a D/s dynamic, or activities that participants do not enjoy, but are interested in creating conflict around for the sake of consensual non-consent play.
Hard Limits
These are limits or boundaries that should not be pushed or crossed under any circumstances for any reason.
Triggers
Triggers are things that create adverse psychological or emotional responses in someone. Common physical triggers include certain body positions, specific types of contact with specific parts of the body, and certain types of auditory stimuli; however, there are many other types of physical triggers. Verbal triggers are also very common. Most people who enjoy verbal humiliation and/or dirty talk have a handful of words that they really don't want to hear during a scene—the effects of hearing them could range from being an irritating distraction to causing a panic attack or worse.
Additional considerations when negotiating play
Clothing: What is everyone comfortable wearing (or not wearing)?
During impact play: Is it okay to touch whatever part of the body is being hit?
"Sexual contact": It is very common while negotiating a scene to say "No sexual contact." Because the phrase "sexual contact" means different things to different people, it is important to be specific and define what that phrase means to you.
For pain: During a scene, using a number system to delineate pain levels can be helpful. For example, the top can ask the bottom "How much does this hurt on a scale of 1 to 10?" During negotiation, define what the target number(s) is (are) for your play.
Checklists: Yes/No/Maybe and similar checklists can be very helpful to do, especially during negotiation; however, it is important to note that checklists do not equal consent. Consent is not, and cannot be, a written document or contract because consent is never fixed and immutable. Consent can always be changed or withdrawn at any time regardless of what was said or written down a day, an hour, or a minute ago.