DAG-related: Separated variables

Hey! I have to construct a DAG, however some of my variables are separated according to sex. I have two BMI variables, one for women and one for men, and this accounts for age and smoking status as well. I’m trying to draw up a time hierarchy, but it seems absurd if Male BMI comes before Female BMI. How do I approach this? Should I construct two separate DAGs for women and men? Does that even make sense?