For individuals who plan on having a full body massage and are comfortable with removing clothing, the standard is to keep your undergarments on. It's a good idea not to remove all of your clothing unless your therapist has requested you do so.

We spoke to two etiquette experts, who suggested leaving a 15% to 20% tip, if you're able. Twenty percent is generous for the massage therapist and easy on the brain, which may be feeling more relaxed than ever after a massage. The math is straightforward.

In a full-body massage, a therapist will massage the entire body during a therapeutic massage. Sessions typically last a minimum of 50 minutes which allows enough time to work over all the major areas of the body like the back, shoulders, legs, feet, arms, hands, and neck.

Since tips are standard protocol for massage therapists, you should assume a 20 percent tip in any massage or spa treatment situation (unless a self-employed therapist specifically tells you their rate is all-inclusive).