There is no possibility of having sexual intercourse without meshing a part of your non-physical self. Sex is such a definite experience that a part of each of you remains forever a part of the other. How many times and how casually are you willing to invest a portion of your total self and accept such an investment from another person, with no assurance that the investment is for keeps?
Stacy Rinehart and Paula Rinehart, “Choices,” pg.92 cited by Josh McDowell and Dick Day, "Why Wait?" p.258