Again, the experiences of men and women, all over the world, prove that, where this act is engaged in properly, according to the laws that obtain in the premises, _it conduces to the highest physical, mental, and spiritual well-being of the parties concerned_. Indeed, it is beyond doubt true that the men and women who have never known this most perfect of all human experiences, have never reached the summit of human attainment, have never arrived at the perfection of manhood and womanhood. Length of life, health of the highest sort, and happiness, the most delectable--all come, these and more, to men and women by this route, _if it is rightly traveled_. Hell and damnation result if that road is wrongly trod! And that's what makes the manner of traveling it so important. VI THE ACT OF COITUS Strictly speaking, the act of coitus should be considered as composed of four parts, or acts, of one common play, or drama. Not that there is a sharp line of demarcation between each act or part, for the _four_ really blend into _one_ composite whole, when taken together, seriatim; but there are _four phases_ of the act which may well be studied separately, in making a detailed review of a sexual meeting of a man and a woman. These four parts are: _first_, the preparation for the act; _second_, the _union_ of the organs; _third_, the motion of the organs; _fourth_, the orgasm. In what immediately follows, these _four_ stages of the act of coitus will be studied and traced in detail, with the utmost care, in the hope that such pursuit may result in the best possible good to the student.