"BUT THE MAXIMUM OF SEX APPEAL WHICH IS POSSIBLE ACCORDING TO ONE'S GENERAL ENDOWMENT DOES NOT NECESSARILY YIELD PERSONAL LOVE"

For example, one my be well liked, regared as an entirely desirable lover. Even singled out by the multitude as an exponent of 'sex appeal' yet miss the joy of love in spite of all that.
It is said that women, more than men, are attracted by a voice. Possibly, the male voice has a wider range in speech, and is capable in conveying stronger and deeper impressions than the female voice. There are of course, cases in which men are profoundly moved by hearing a female voice. But unless it is linked with other impressions, either present or remembered, the female voice alone hardly arouses any desire they say.

The impression 'falling in love with a voice' is hardly an exaggeration they say. Love at first sound is possible, just as love at first sight is, although the former, is undoubtedly is rarer. It must be bear in mind that when people speak of love at first sight, they mean that all impressions gained at a first contact have aroused attraction.
The general factors that produce sex appeal can be distinguished since in the main they appeal to all, though in varying degree. For people who love attribute, all sorts of qualities and virtues becomes the object of their attraction as well as affection. Where love reigns, that 'beauty is in the eye of the beholder' is the very truth. The eyes of love often see what others do not-cannot-see.
No doubt a combination of sexually stimulating impressions will bestow sex appeal upon those of either sex from whom they emanate.