I like that this is not a suggestion but an active instruction- “Flee”. It should be a conditioned reflex action inbuilt in us. A lot of great men and women have been ruined because of this, so it’s risky to play around thinking we can handle it. Once you get those sexual nuances or undertones in a relationship with someone, it’s time to lift your feet and flee. Don’t rationalize it because you may not escape once caught in the web. For me that is how I survive it and I also think it’s easier when we maintain purity of heart and motive towards others, that way we see purity in all they do and can be honest with ourselves to renew our mind if it is wandering away to inordinate desires. If you fall, pick yourself up, get help and get better.