In many parts of the world, hobby horses are for women, work horses for men.  To get an estimate of the sex composition of any discipline, get out your pencil and count the number of males and number of females that you see in Google images when you search for various words or phrases.  To see if women own the world of hobby horses, search for “pleasure horse” and “work horse” in Google Images. Rider sex is not evenly distributed across disciplines. Disciplines such as dressage, jumping, and trail riding differentially draw males and females. In the U.S., many girls have Barbie horses — but you won’t find many boys with them.  Without Barbie horses, dolls and doll buggies to practice with, childhood leaves…