"5. The fact that many women satisfy their husbands when themselves disinclined. This is like eating jam when one does not fancy it, and has a similar effect. It is a great mistake, in my opinion, to do so, except very rarely. A man, though perhaps cross at the time, prefers, I believe, to gratify himself a few times, when the woman also enjoys it, to many times when she does not. "6. The masochistic tendency of women, or their desire for subjection to the man they love. I believe no point in the whole question is more misunderstood than this. Nearly every man imagines that to secure a woman's love and respect he must give her her own way in small things, and compel her obedience in great ones. Every man who desires success with a woman should exactly reverse that theory." When we are faced by these various and often conflicting statements of opinion it seems necessary to obtain, if possible, a definite basis of objective fact. It would be fairly obvious in any case, and it becomes unquestionable in view of the statements I have brought together, that the best-informed and most sagacious clinical observers, when giving an opinion on a very difficult and elusive subject which they have not studied with any attention and method, are liable to make unguarded assertions; sometimes, also, they become the victims of ethical or pseudoethical prejudices, so as to be most easily influenced by that class of cases which happens to fit in best with their prepossessions.[164] In order to reach any conclusions on a reasonable basis it is necessary to take a series of unselected individuals and to ascertain carefully the condition of the sexual impulse in each.