Girls, I'm not very experienced with men. How do I react when my boyfriend does things like this?

I'm 23 and this is my first boyfriend, been together a month. He's 25 and has experience and probably needs. I went to a beach house with friends and he came to visit me for a day. I was wearing shorts and I caught him stealing a look at my legs. We chatted for a bit and he told me he had to leave in a few minutes and wanted to see me alone. I agreed, and we went behind the house and he kissed me and then lifted my shirt and kissed my belly and I just let him. I know he won't force me to do anything I don't want to, bit how do I react to this?

Girls, I'm not very experienced with men. How do I react when my boyfriend does things like this?
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