Initial attraction is usually based on physical appearance. To tie this into this thread, most women say crotch observing and penis size estimating isn't something they consider when looking a guy over, although some admit they can't un-see the fact that some guys are clearly packing. The person who catches your eye, say at a friend's party, might be disappointing when you decide to approach them. The woman with smoking hot looks could be totally narcissistic, her one and only interest is fashion, dry ice in bed (if it gets that far), etc. The good-looking, tall, & muscular guy could be totally narcissistic, an overgrown teenage jock, one-dimensional in bed (if it gets that far), etc.