Tribulus terrestris is the #1 selling testosterone booster, and the best example of a supplement that increases libido, but has no effect on testosterone.
Ab belts may cause muscle contractions if used properly. But the belt alone cannot produce six-pack abs. The real challenge to ab definition is the layer of fat that lies right under the skin, hiding muscle tone.
Seat belts are made for adults and do not fit young children correctly. Booster seats raise children up so the adult seat belt fits them. Booster seats position the shoulder belt across the shoulder and chest, not the neck. Booster seats also keep the lap belt low over the hip and thigh bones, not across the belly.