who is the sexiest actor in the bollywood?

I would prefer Sharukh khan.

Shahrukh the coolest with looks.
And I like john and hrithik for their physique.
And at last amir khan for his acting skills.

You could have given Akshay Kumar too as a option.

Bollywood is made up of more than just simple looks and body structures, but since your question addresses it the sexiest dude/s to me are Abhishek and John A. however Hrithik is considered to be better looking and more physically fit than either one of them, they can carry out any look much better than Hrithik who acts in a very humble manner for the kind of roles given to him. For example check out Abhishek Bachan in DHoom 2 and John A. in DHoom. They both are super cool and many girls out here in Europe find them incredibly attractive.