Fair question, I am in fact a straight male and if that situation were to arise, I'd simply take it as a compliment that someone finds me attractive, whether that be a male or female it makes no difference. However, I wouldn't lead the guy on as I wouldn't be interested and that'd be unfair. I'm sure we'd have a laugh about it. That has happened to me before and it wasn't awkward at all, it was quite funny actually.