Most nipple toys play with restricting blood flow to the nipples, but these body suckers work by increasing blood flow instead. As the suckers draw blood to the area they're applied to the sensitivity and size increases -- if left applied the area, nipples for example, will stay swollen for a time after the suckers are removed. Get creative with where to apply them, the suction itself is a very unique sensation even without the added benefits of increased sensitivity. For those who love marks, these tiny but mighty suckers can leave hickey-like marks wherever they're put -- how long the marks last varies, but they'll serve as a tender-to-the-touch reminder for as long as they remain.