I often cough it up to nervousness, anxiety, stress, or just not being in the moment. I do ask sometimes is it me? A sort of temperature check if its the chemistry between the two people. Of course, honesty is the best policy but I've never had a gentleman say yes lol, so yes you still wonder if it is.
I had an appointment once on a Monday morning at 9am for an hour, he answered the phone I know 3x during our appointment. WRONG! I was pulling out every "trick" through it all to little success..
His body was there but not his mind; I say as well as us women, we have to BE THERE physically, mentally and emotionally. Not sure if that makes any sense; but often the true gfe or a relaxing session starting with massage/touch and conversation gets the emotional and mental preparation before entering into a great physical session.
So shut off the phones, RELAX YOUR MIND & BODY and "be in the moment".
And yes, some fellas I do tell them after an hour or two; you're one that needs to be booking 2 or 3 hours. I rarely ever visit a new fella for less than an hour our first visit because of just that. Repeat visitors rarely take a qv/hh with me but by that point you both know how long/what it will take to have a true GFE experience or a full body Sensual Massage with a wonderful happy ending.
Hope that helps from a woman's point of view.