Sorry savysac, I have to disagree with you. Not all of us think the world revolves around our penis. It's not as black-and-white as they either want to jump anything in pantyhose or their liars/gay. Maybe in your little world, but not in the real world.
To answer the original questions, yes, some guys (as we have seen), let their penis do the thinking when it comes to anything in a dress. And I'll admit most guys will have sexual thoughts when they meet an attractive woman.. but the difference between the evolved man and the caveman is how much those thoughts dictate our actions.
I always say.. "Men are pigs. Some of us just know when to be, and when not to be."
Some guys will think "Ooh.. she's hot. Lemme get her into bed."
Others will think "Boy, she's really attractive... seems really nice, too. Lemme get to know her." Of course, there are other thoughts going on like "Great smile... nice boobs... look at those legs." But rather than letting those thoughts dictate our actions, some of us truthful, straight guys are also thinking "She's really nice... what an infectious laugh... boy, is she funny." Or, conversely, "Man does she like to talk about herself... want some cheese to go with that whine... How long can one person talk about their ex-boyfriend... I wonder when she flies if she has to check all of her emotional baggage at the gate."
Those of us with some sense of decorum WILL want to get to know a woman before we consider having sex. Personally, having not been raised by wolves, I would take an interest in a woman as a possible friend and then see if there's more there. At least then, if there's no real sexual attraction (crazy me.. I insist on a mind and personality lurking inside an attractive body), but there is a spark of friendship there, I've made a friend. And for some crazy reason it's worked... I find women to have sexual relationships, and I make friends as well.
Of course, I'm one of those apparently rare guys that would only date women he considered potential marriage partners. I don't see the point in dating someone I would never spend my life with solely for the sake of getting them into bed.
Guess I'm really gay.. eh? I dunno who'll be more surprised, me or my girlfriend.