i'm a guy. i know exactly what he's up to so listen. if you value your marriage and only you can answer that question...run for the hills. do not go to lunch. how many friends do you need at your age any way? really. he's got the hots for you and you're smitten with the attention...admit it...come on. this has all the trappings of a marital trainwreck up ahead. stop at the crossing, get over the flirt, back the car up and go home. trust me...a solid marriage trumps a hot, sweaty, guilty lay every time.