Big pecks and erect nipples are a major fetish, from beefcake porn to Tom of Finland-style pictures. The areola (the darker coloured circle of skin around the nipple) isn't sensitive. The actual nipple is where the sensitive nerve endings are. Nipples are one of the body's erogenous zones they get hard and erect as they get stimulated. The sight of this can be a real turn-on. The more work tits get, the more they stand out, becoming an even more powerful sexual symbol.
For some men their tits are hot wired to their cock, with tit play the quickest way to get them rock hard and groaning with delight. Tit Torture (TT) involves the quest for sexual gratification by stimulating the nipples. Just as in Cock and Ball Torture (CBT) and Corporal Punishment (CP) there are many methods used in this practice. Be aware of what you are getting into; as in any BDSM activity consent, negotiation and respect of limits are essential for an enjoyable session. The pain involved can be pleasurable, with the body releasing endorphins; these are natural chemicals that act as painkillers (the reason tit play can get quite rough) and can cause a feel-good sensation.
For a Top the kick comes from exercising power by subjecting discomfort (mixed with pleasure) on the bottom and enjoying their reaction. A sadistic pleasure comes from controlling the Sub’s experience, switching between different levels of force and using tit play as punishment, made even more of a turn-on if the Sub’s hands are tied behind his exposed chest. The Bottom gets his kicks from feeling helpless or at another man’s mercy, for instance by sucking on a nipple symbolising his submission and surrendering to the power of another man.
Tit Torture or Tit Play entails squeezing, pinching, sucking, biting, rubbing or clamping someone’s nipples. You can use your fingers or objects like tit/nipple clamps, clothes pegs or bulldog clips to stimulate, pierce the nipple, either permanently with jewellery or just for one sex session with needles. In addition, suction cups (including ones to remove snake bite poison) and glass or rubber suction cups placed over the nipple remove air from around it, with the pressure forcing blood into the nipple, making it larger and more sensitive. The bigger the cup, the stronger the suction; some have a hand pump to suck out air. Regular use of suction cups can make the nipple grow bigger. To avoid bruising and blistering, 10 to 15 minutes is the maximum recommended length of suction play. When using suction for stimulation, be careful as too much suction causes bruising or “hickeys”, which are signs of broken capillary blood vessels. For extra stimulation weights can be hung from the nipples. The body will adapt to the pressure on the nipples and the pull from the weights. However, once the weights are released the clips and clamps removed, pain will be experienced more intensely when full circulation is restored. You can bind the chest with ropes, tapes, leather, etc. Binding restricts blood circulation and is therefore not recommended for extended periods of time. If the bound area starts turning bluish or purple it is time to restore the blood flow ASAP, hence constant monitoring is necessary.