BLINDFOLDSSexual blindfold use is common in and outside of the bondage community, one of the initial things recommended for sexual variety. Blindfolds (along with feathers and handcuffs) are commonly sold in novelty "bondage kits" marketed toward non-BDSM practitioners. Many impromptu items already found in the bedroom lend themselves to such use without preparation or prior purchase of specialized equipment. Blindfolds can be worn during BDSM situations by the submissive.
Use of a blindfold is said to enhance the remaining senses of the wearer, focusing attention on sound, smells and physical contact. This increased awareness is said to allow for greater excitement and anticipation by eliminating visual cues, as one cannot see what to expect. It also requires trust of the submissive, with all the emotional ramifications that entails.
Information from Wikipedia