Think of the cost to your marriage before giving in to this man

About a year ago while on a business trip I met a funny and smart man who is also married. We got on really well, talked for hours, and have kept in contact since by the occasional email. He recently told me he is separating from his wife and would like to meet me again. I am tempted to say yes but I am afraid it might lead to an affair. I have two teenage children.
It can be hard to resist the visceral pull of a sexless affair. You have kept the communication channels open by email. Through this contact you are maintaining an interest.