I am the opposite. I can develop a deep lust or craving without even knowing the person. Actually I tend to develop lust, physcial connection and then emotional connection. Its rare to go the other way.
I have never really paid attention, but I *think* it is the same for me. I initially became poly because I am just so damn horny all the time. Definitely I have much stronger lust feelings in the beginning, but it is pretty quick - Sex is tied very tightly to emotions with me. Touch is my "love language" so it is too difficult for me to do the one night stand thing. At least, that was my thought but I did have a hookup a short while back and I didn't get all wrapped up with the guy. Prolly that was more because he was so terribly awkward in the sack though. Lol