What is it about the opposite sex that makes you weak at the knees and can be entoxicating? (Notice where this topic is.. so it be nice to NOT have sexual responses but if that is all you have then do so...)

For me... it can be:

A laugh
The smell of there hair
A smile
An "awwwww" (something about a lady doing that is so entoxicating)
most of all.... A PERSONALITY...

Screw looks (though they are a major plus for myself)... I need someone I can talk to... and who is not some mindless Pop Culture Driod... How about you Ladies and Guys?