'If you want a male health book to recommend to your readers for Christmas … this slim, jolly and readable text is probably the best male health handbook on the market.' Thanks to Dr David Delvin for reviewing my User's Guide To The Male Body is such glowing terms.
Winner at this year's Medical Journalists' Association Book Award, David is a specialist in Family Planning and Sexual Medicine and author of 32 books on family health and sexology including the Good Sex Guide and Backache. (I imagine you can buy the two as a pair on Amazon.) So he knows what he's talking about on many subjects of particular importance to men. Indeed, the top story on Google when you search for 'Dr David Devlin' is Facts about penis size. And there's not many men who can say that!
(If on the slim chance you are interested in this topic there is a Penis Size FAQs article on malehealth.)