I explained that "x times per hour" bit to a woman once who thought, as stated here, that it involved some deep fantasy. It doesn't. Here's the example I used. Imagine you could read the mind of the guy sitting in the office working. "...need to calculate the cash flow oh look there's that hot secretary with the great ass, love to do her, but the finance group hasn't released the figures yet so I really can't get an accurate account there she is again--great set of tits, love to suck on them--but the boss is demanding it. Damn it, I'll have to call Karen (picture that nice rack she's got) and see if she'll give me a heads up..." That's three sexual thoughts over the course of probably a few seconds. Most men simply integrate it into their thought pattern and move on.