Is it considered a red flag if a guy you barely know asks to sleep with you but claims to want a serious relationship?

Cherrylicious
Every time I meet a guy and exchange numbers with him, they never ask me out and we'll be talking for a few weeks but as soon as they want a serious relationship and "get to know me" is when I suddenly hear how much of an amazing woman I am and how they've been wanting to date me for a while and how they want something serious and I would only hear this when they wanna sleep with me and even requesting hook ups swearing me "the world" and how they really wanna be with me.

Not saying that all guys only intention is sex because I know every guy is different and wants sex at different times but would you consider it a red flag if a guy you barely know wants to sleep with you before getting know you?
Is it considered a red flag if a guy you barely know asks to sleep with you but claims to want a serious relationship?
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