In the Heinemann textbook it says "An ERD is a graphical method of identifying the entities and showing the relationship between them. "
Cambridge says "An ERD is one type of schematic diagram. It maps entity types, the relationships between them and the characteristics of the relationships...
My SDD class has 3 girls (including me) and we're topping the class (which has around 12 people) so I doubt that SDD is any easier for males than females. I also do IPT and there's only one guy in my class and 3 other girls.