in most cases it doesn't make a difference. if he's a liar, he would have stayed in character as long as it took. matter of fact, the sooner you sex him, the sooner you get to see the real him and the less time you lose. you might get a lucky break and he might slip/make a mistake while you wait but then you're counting on luck...that's my opinion at least.
well eventually his lies caught up with him...but I feel like by the time I realized he was a liar my emotions and the sex had already made me want to "work things out" I feel like if I wouldn't allowed him to give me the long stroke...I would have kept it moving on his arse...
