Is my friend gay?

He knows I'm bi.He's done these things before: Changed around me, he's always shirtless around me. Doesn't seem like a big factor.A few times he said this to me "dude some gay guys aren't bad at all a lot are actually really good looking." (Yes, I know it's dumb to say).And once he was like "bro help me with my Snapchat" because he accidentally posted a dick pic on his story. I forgot what happened entirely but he showed me the picture.My gut tells me he's bi but idk. I've never seen him on Grindr or Tinder but I do know he doesn't have a car anyway. He's a fuckboy who hooks up with a lot of girls.