How to Say No to a Date Politely 

the most effective line is: 'sorry, i'm already taken'. it's vague and pins the rejection onto your situation rather than his inability to look like jason momoa. if you friendzone or tell him you're not romantically interested he could be insulted or take that as a challenge (remain in a friendship with you until he can prove himself). if you know he likes you and you don't like him back be a good person, don't accept anything from him and shut the door completely to any kind of relationship.

You bring up some interesting questions :)

so needed!!