As far as rubber bands or elastic bands go, or anything around your nipples... if you are cutting off the circulation I wouldn't recommend it. If you do it, do it for very short periods of time as you could lose the sensitivity in your nipples and your nipples altogether if it is too tight. (Again, I am talking extremes here... a good way to know the difference... red is a warning sign but blue is a definate no-no). If your nipples (or anything else) is turning blue you need to know that could lead to worse things.