Master Series Nipple Amplifier Enlargement Bulbs with O-Rings
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Aggrawal, Anil (2008). Forensic and Medico-legal Aspects of Sexual Crimes and Unusual Sexual Practices. CRC Press. p.149. ISBN 9781420043099.
Slide the barbell through your piercing. You may need to push the shield into your breast as you do this, so that the barbell goes through over top of the shield as shown above. a b c Archer, Sophia (15 September 2020). "Breast Bondage for Beginners (Safety + Tips for Getting Started)". Stay Sexual.
a b Adriana (16 October 2020). "Breast Bondage: Easy Harnesses Even If You've Never Used Rope Before". Bad Girls' Bible. There are several different types of nipple clamps out there, and the type you choose will def depend on your experience level. Adjustable nipple clamps (such as tweezer clamps, alligator clamps, four-point clamps, and nipple lassos) are best for beginners, while non-adjustable clamps (like clothespin clamps, magnetic clamps, and clover clamps) are better suited for more experienced users. A few tips for getting the best bang for your nips: Consider your nipple size and sensitivity Twisting the nipples produces a painful sensation  and nipple pain can be intensified by twisting nipple clamps, an action which pushes the nipple into the breast.  A titty twister is a BDSM device used to inflict pain on the breasts and especially the nipples in this way. They are made in a variety of styles, but all have nipple clamps that can be made to rotate once in position, twisting the breasts and nipples of the person wearing the device. 
Bring a new dimension to sensation play with these soft, feathered nipple teasers. Featuring rubbed-tipped alligator clamps, these bbs are adjustable, affordable, and just really damn cute.
Newbies to nipple play will also love these crystal-embellished nipple lassos from CalExotics. Simply slip 'em over the peaks of your nipples and adjust the soft, silicone cinch by sliding the silver bead up or down—no pinching or piercing necessary. Weiss, Margot (2011). Techniques of Pleasure: BDSM and the Circuits of Sexuality. Duke University Press. p.220. ISBN 9780822351597. Indeed, practices focussed on the breasts and genitals are called both play and torture: tit torture, nipple play...