Do you think he is serious?

I met a guy on online dating

He is from Europe and I'm from Africa, he convert to Islam

We like each other we have been talking one month, I know there's different in our culture So I want to know is it normal to talk about sex , he wants to show me his private part Then I stopped him and he opened the topic again I really like him but I don't know if he serious or just talking to me to have fun

Do you think he is serious?
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