What an interesting thread! Artie, you are definately not alone in experiencing the IQ drop when faced with an attractive woman. In fact, there is research supporting that this happens to a lot of men.
Whether it's a learned behaviour, or hormone based is unclear
Here is a link that points to the research:
http://www.asylum.com/2009/09/04/bea...er-men-stupid/
If it were me, I would ignore the comments. After all, this *is* the internet, but the research is real.

On the other hand, when estrogen peaks prior to ovulation, women experience a similar drop in IQ. (Behavioral Neuroscience 2000;114:1245-1250.).

Hmmm... kinda makes you wonder how the human race persists doesn't it?

On a personal note, I would put myself in the intelligent rather than attractive category. I'm quite happy and single. I do sometimes wonder if the fact that I don't need anything from men somehow puts them off, but I also wonder if I'm not pretty enough for their attention.

In any case, if you take a step back and look at the dance between men and women, to me it all seems rather ridiculous. We are all human after all.