Sex should be a perfect balance of pain and pleasure. Without that symmetry, sex becomes a routine rather than an indulgence.
Marquis de SadeNo lover, if he be of good faith, and sincere, will deny he would prefer to see his mistress dead than unfaithful.
Marquis de SadeFear not lest precautions and protective contrivances diminish your pleasure: mystery only adds thereto.
Marquis de Sade