I went home with a guy, once. He seemed nice. I told him, as I was agreeing to head to his place that "nothing is going to happen" and he was fine with that. We got back to his and he poured some wine. We drank some whilst listening to Radio 6. He gave me a quick kiss and I didn't mind. Moments later he kissed me in a more significant way and I kissed him back. He then put his hand underneath my underwear. I removed his hand and reminded him he'd said nothing would happen.
I thought that would be enough to make him realise I was serious, to be honest. Potentially naive, in hindsight, but that is what I thought. I still thought we could have a nice time drinking wine and listening to good music.
He again put his hand on my genitals, and I removed it, a couple more times, before I told him if he did it again I would leave. He said he understood and, moments later, he tried again and I very hurriedly left.
There is quite a lot in this thread that makes me think the fact I agreed to go back to his and that I enjoyed kissing him back would make some of you think that he did little wrong.