How does a woman know if a man is actually physically attracted to her?

How can a woman know for sure when a man is actually physically attracted to her? I've been friends with benefits with a guy for over a year. I'm curvy and I have huge breasts yet the only type of women he follows on social media are skinny and athletic chicks. When we first matched on the dating app I asked him if he liked curvy women and he said yes. Once he told me he wouldn't have sex with a woman he's not attracted to. He even said "wow when he saw my pictures on my profile. Yesterday when I saw him he was kissing me, wanted me to be on top. I was dressing sexy though (I usually don't) so maybe that made a difference?

Anyway, how does a woman know that a man isn't just having sex with her because he can't get what he really wants? (the women he follows on social media) Verses him actually being physically attracted to her?

He has told me that he's insecure and doesn't think he's good in bed.

How does a woman know if a man is actually physically attracted to her?
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