Flirting or friendly banter?

My husband and I have couple friends who we spend a lot of time with. We went on holiday to France recently in a campervan together, for example, and they lived with us for a bit. The male friend and I are very similar personality -wise, and so are my husband and the female friend. When we chat over message, the male friend brings sex into the conversation, saying things like "you have a dirty mind", or "is that the kind of thing that gets you excited". He often touches me gently, especially when he's drunk, and today said he was excited to see me because then he could "I’ll get to give you a big hug and lift you off the deck again haha". The other day we were talking about how it had been a while since either of us have had sex, because our spouses are away, and then the next minute he says he's looking forward to having sex with his wife next time he sees her. So, flirting, finds me sexually attractive but wouldn't cross the final line to cheating (he's a real gent). I won't lie, I do find him attractive, which my husband knows and is fine with, because he trusts me. I also would never cheat, but I have to admit, it does turn me on to flirt with this guy

Flirting or friendly banter?
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