Why would a guy try so hard to persuade me for sex early on when I’m looking for something serious and he knows that?

So he’s made out he’s looking for something serious and long term too. However he talks about sex a lot & mentioned how if a girl doesn’t give him sex men usually find it somewhere else.

I have made it clear that i’m open to it in future but i’m looking for serious. It’s very early on and He then proceeds to invite me over or try to make dates where he’s able to behave sexually.

why doesn’t he just go for someone who is looking for casual?

Why would a guy try so hard to persuade me for sex early on when I’m looking for something serious and he knows that?
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