Wiseman's book is a self help book based on scientific studies. For example he reports on studies where they compare the number of telephone numbers of potential partners a person can get depending on whether there is a small amount of contact. The slight problem I have is that he reports a 10% increase in something, but then he doesn't give an error-bar -- but I suppose I should read the original papers.
Note that I don't want to give the impression that the book is just about getting laid, some of the chapter titles are: happiness, creativity, parenting.