“So a boy with lists of girls is therefore more likely to sin than a boy with less prospects?”
Of course. The more opportunities one has to do aveiros, the greater the chances that he will do it, don’t you agree?
“People don’t stand around at a wedding and say “Who do I sin with next?”
Some don’t, some do.
“They say “This seems like a nice person, let me get to know them better.”
You can’t be serious. Why do you think people of opposite genders want “to know each other better”?! It’s called tayveh, and it doesn’t end there!