Are there any signs or red flags that a guy just wants sex?

Anonymous
So, I recently had a crush on a very good looking guy that I met online. Initially he seemed like a great guy; very cool, interesting and we were getting along very well. I was smitten with him and I thought he felt the same.

Unfortunately I found out that the guy has been flirting and hitting on a thousand girls online (one of them actually accused him of sexually harassing her; it's a long story). I feel like an idiot for believing his cheap compliments and sweet talk.

I'm very scared that men I date will pretend to care about me, then use me and ditch me. If this has happened to you, in hindsight were there any red flags or clues?
Are there any signs or red flags that a guy just wants sex?
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