Can you kiss/make out with a person that you don't find attractive?

So how would you go about kissing a person on the lips that you don't find sexually attractive? Would it be easy for you or hard? Let's say a girl is into you, but you dont see her in that way, and she insists too much for a passionate kiss before you two depart, and move on with your lives.

And girls, would you kiss a guy on the lips just for curiosity? If you dont find him that much appealing, but he's dying inside to kiss you?