Hi there
Isn't it ironic that it's the man lacking in self awareness or concern for your comfort that is kept from being 'offended'. I think its important to treat people with respect and care, but that doesnt mean you have to tolerate that sort of business. I know of men who are aware of their excessive perspiration who carry a pocket hanky to wipe themselves between dances, or who explain that they are using an open embrace because they are sweaty. I dont think its offensive to ask the man to keep a little distance if his sweating is offensive to 'you'. Firm but gentle me thinks.
As to being held tightly...if I have less space to move in, I try and make smaller steps. If he holds me that tightly, I close my eyes, try to maintain my connection to his dance and let him lead the way. If it doesnt work, then perhaps don't dance with that person again. I'm quite self critical, so I always think that 'I' need to have good form regardless of my partner. Obviously that's not always the case either (with a little retrospective reflection). I kept thinking about your concerns, that others would think you have poor form, and I think that this is the cause of a lot of stress for many men and women. For myself, I feel that if I start to get too worried about how others judge my 'form' (and it is far from perfect), then I diminish my joy. The joy that comes from dancing, connecting, the music and ofcourse being with friends.
Leche