Write an AI program to detect either user is male or female?

Question

Actually I've made an BMI calculator in which i wanna add an AI feature which will automatically detect that if input given by user is male then it will print mr.and then username and vice versa

Answer 1

I'm not sure if it is practical. Even if you'll reach 95% accuracy, the rest 5% of users will be pissed of. Think also of different approaches to gender in different societies. The task you've chosen is complex as hell.