What do you do when a guy tries to tickle you?

We just started dating he just randomly asks if im ticklish then he tries tickling me and i laugh. He just smiles and said i guess that's a yes. He did this a couple of times. I really like him but i don't know how he wants me to react when he does that. Maybe he wants me to grab his hand or something i don't know. Can anybody help me? Especially guys