I must say I'm not sure if it's possible to really do that.....as a woman I usually have other parts of my anatomy to "place" whilst doing manual therapie on head and neck. Just standing now at my treatment table (without a patient on it)I really can't get the bit you think you are noticing during treatnent anywhere compromising. Depends on the proportions of patient/physio and height of bed. Needless to say standards of political correctness in British physio used to be very high so no way were physios in my day going to try anything with a patient during treatment....instant dismissal would be implimented! Otherwise as PhysioBob indicates one does have to wind ones own (physio) body round treatment plinths and patients anatomies to save the physio joints and usually one avoids certain things with some patients to avoid misundertsandings.