I am 34 and a dom, and I am going more towards D/s relationship than M/S. I have always respected my other partner, but I think M/S or SM or D/s relation (sexual or long term) can be a bit tricky, as you gain power over the other, and human beings getting power, it gets to their head. Thats why I 've always said that sub needs to set his limits.

As a summary : I am a dom and always respected my sub, but I know we are rare breed.