first off, you have to have sex with someone to enjoy the fruits of your labour, such as you describe. lol.
2nd, and no means least, to me sex is the icing on the cake, so to speak; It only comes 2nd to a loving realationship.
3rd, the methods so described in the book are I think something to do with spiritual development of a kind. They should not take precedence in a realationship to the determint of said realationship.
In other words, they're not the be all and end all,and only a means of expression.
In a nutshell, I have to agree.