HEAD
For our purposes here we are talking about the area above the eyebrows over the top and down the back to the junction with the neck and down the sides to the top of and behind the ears. Technically areas such as the face and ears etc. are part of the head but they are dealt with separately. The head contains the brain, though you may sometimes think that organ is located elsewhere in some people! Because it contains the brain and the brain is fairly important the head is usually not much associated with BDSM play but even here there are exceptions.
Let's get one thing out of the way immediately. The head is NEVER a target for any sort of CP play, in fact great care should be taken to ensure that it is not even struck accidentally during play. That the flick of a flogger tail may not do any physical damage or even hurt much isn't the point. Striking your sub's head when they know, and know that you know, that isn't regarded as safe is likely to destroy a lot of trust, faith and confidence. Deliberately striking the head, even with a slap around the back or side is totally irresponsible!
- One part of the head that does make lovely play material is hair. Properly cared for it is wonderful to touch and smell and strong enough to be useful in several ways. Some sub's delight in the feel of their Dom'mes hand tightly grasping their hair, perhaps using it to turn or direct their face to where they want it. Tugging a good handful of hair is painful enough for the sub that it gets their undivided attention without leaving any marks or requiring any toys. Done appropriately it is a powerfully dominant action. For minor pain play single hairs can be plucked out of course. If long enough, hair can also be used for bondage. The sub's head may be tethered by it as an alternative to using a collar or head harness and we recently saw one young femsub with beautiful dark locks which were so long that they had been used to tie her wrists together behind her back. As a highly visible demonstration of submission the sub may change their hair to suit the Dom/me's preferences or command. Their hair may be cut, dyed or shaved off completely or partially, for either the look or for humiliation. Cuttings of long hair, either the sub's or Dom/me's can also be made into a sensual and delicate whip with which to tease and caress the sub. Some Dommes with exceptionally long hair can even use it in this way while it is still attached to them. Dom/mes who have had their sub's head shaved often report that they love the smooth cool feel of the scalp and can generate wonderfully teasing or erotic sensation there.
Generally you can't go far wrong in playing with a sub's hair. It doesn't bleed and anything you do, other than plucking it out with the root, will be temporary. However, either because of pride, or because of past experiences, or because it is attached to the head and near to the face, some subs hate to have their hair pulled or otherwise controlled. Even though you may not do any physical harm, all play must be as consensual as if you were whipping your sub.

- Although electric shocks to the head can be extremely dangerous electrical stimulation of the scalp can be an amazingly novel sensation. The best tool for this job is a violet wand, which also has the advantage of being particularly spectacular in use. Violet wands affect only the surface layers of the skin but most other electrical equipment used in BDSM is designed to send pulses deeper into the body and so is not suitable for use on the head.
It is generally accepted that the brain works through a combination of electrical and chemical activity. Disturbing the electrical activity with outside interference is obviously very unwise so don't be tempted to experiment with other electrical equipment if you don't have a violet wand available. As always with a violet wand keep the chosen extension moving, in order to avoid burns.
- Most subs don't have enough loose skin or flesh over their skull to allow for clamping or play piercing. If they do then an arrangement of small clamps can give a dramatic visual effect, though not a particularly erotic sensation.
The usual recommendations for clamping and piercing apply; sterile procedure, good hygiene and don't leave clamps on too long.
Have fun and use your head!