The first and most important principle of sexual choice is that it be made through the conscious and deliberate faculties of the mind rather than letting those pulsating genitals call the shots. If, as Dr. Reuben says, the brain is the largest of man's sex organs, it seems only fair that it should have the biggest say as to when and how the sex organs are to be used. This choice is too important, has too much of either happiness or unhappiness riding on it, to turn the decision over to one's animal instincts. Human beings were given intellectual capacities above the other animals expressly that they might use them to advantage, to the enhancement of the fun and profit of the whole creation.
Physique is irrelevant to the matter at hand.
Physique is not a positive sign of what to look for, but according to Reuben, an eagerness to show that physique is definitely a negative indication. Those who make the biggest pitch turn out to be no catch at. But in seeking out a sex partner, avoid at all costs those who are most eager to become sex partners. Well, an addict is a person who just has to have something even when he knows it is risky, unwise, and likely to be regretted. A drug addict is a person who has to have drugs no matter what, and a sex addict is a person who has to have sex on the same basis.