Girls, How do you handle when a guy flirts with you physically like this?

I'm twenty four years old and I'm not very experienced with dating because i was finishing up my master's. I go to the gym to keep fit and there is this guy there who I've spoken with a few times and he flirts with me. He's tall and well built. Like one time he touched my arm when he walked by me. Another time, he poked the sides of my waist. He asked me out on a date. On the date we went for a coffee and talked a bit. We got kinda flirty and he lifted my shirt and tickled my stomach. I'm not really used to being touched by a man, I like him and I don't mind but what do I do when he does things like this?
Girls, How do you handle when a guy flirts with you physically like this?
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